Bring back Elasticsearch RestClient auto-configuration

Prior to this commit, Spring Boot would only auto-configure the
`RestHighLevelClient` and `RestClientBuilder` if the
`RestHighLevelClient` was present. This was done in 1d73d4ed.

This commit brings back the exposing of the `RestClient` bean in when
exposing the `RestHighLevelClient` or when the `RestHighLevelClient`
is not present. It allows for using the auto-configuration and its
customizers of the `RestClientBuilder` in a similar way as it is done
for the `RestTemplateBuilder` and the `WebClient.Builder`.

The presence of the `elasticsearch-rest-high-level-client` module is
now optional. This opens the door for potentially adding support for
the new Elasticsearch Java Client[1] that is based on the same
`RestClient`.

The health contributor and its configuration has also been updated to
only depend on the low-level RestClient.

See gh-28496

[1] https://github.com/elastic/elasticsearch-java

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/elasticsearch/ElasticSearchRestHealthContributorAutoConfiguration.java

@@ -44,14 +44,13 @@ import org.springframework.context.annotation.Bean;
 @ConditionalOnClass(org.elasticsearch.client.RestHighLevelClient.class)
 @ConditionalOnBean(org.elasticsearch.client.RestHighLevelClient.class)
 @ConditionalOnEnabledHealthIndicator("elasticsearch")
-public class ElasticSearchRestHealthContributorAutoConfiguration extends
-		CompositeHealthContributorConfiguration<ElasticsearchRestHealthIndicator, org.elasticsearch.client.RestHighLevelClient> {
+public class ElasticSearchRestHealthContributorAutoConfiguration
+		extends CompositeHealthContributorConfiguration<ElasticsearchRestHealthIndicator, RestClient> {
 
 	@Bean
 	@ConditionalOnMissingBean(name = { "elasticsearchHealthIndicator", "elasticsearchHealthContributor" })
-	public HealthContributor elasticsearchHealthContributor(
-			Map<String, org.elasticsearch.client.RestHighLevelClient> clients) {
+	public HealthContributor elasticsearchHealthContributor(Map<String, RestClient> clients) {
 		return createContributor(clients);
 	}
 
-}
+}

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/elasticsearch/ElasticSearchRestHealthContributorConfigurations.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2012-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.actuate.autoconfigure.elasticsearch;
+
+import java.util.Map;
+
+import org.elasticsearch.client.RestClient;
+
+import org.springframework.boot.actuate.autoconfigure.health.CompositeHealthContributorConfiguration;
+import org.springframework.boot.actuate.elasticsearch.ElasticsearchRestClientHealthIndicator;
+import org.springframework.boot.actuate.health.HealthContributor;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Elasticsearch rest client health contributor configurations.
+ *
+ * @author Filip Hrisafov
+ */
+class ElasticSearchRestHealthContributorConfigurations {
+
+	@Configuration(proxyBeanMethods = false)
+	@ConditionalOnClass(org.elasticsearch.client.RestHighLevelClient.class)
+	@ConditionalOnBean(org.elasticsearch.client.RestHighLevelClient.class)
+	@Deprecated
+	static class RestHighLevelClientHealthContributorConfiguration extends
+			CompositeHealthContributorConfiguration<org.springframework.boot.actuate.elasticsearch.ElasticsearchRestHealthIndicator, org.elasticsearch.client.RestHighLevelClient> {
+
+		@Bean
+		@ConditionalOnMissingBean(name = { "elasticsearchHealthIndicator", "elasticsearchHealthContributor" })
+		HealthContributor elasticsearchHealthContributor(
+				Map<String, org.elasticsearch.client.RestHighLevelClient> clients) {
+			return createContributor(clients);
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	@ConditionalOnBean(RestClient.class)
+	@ConditionalOnMissingBean(org.elasticsearch.client.RestHighLevelClient.class)
+	static class RestClientHealthContributorConfiguration
+			extends CompositeHealthContributorConfiguration<ElasticsearchRestClientHealthIndicator, RestClient> {
+
+		@Bean
+		@ConditionalOnMissingBean(name = { "elasticsearchHealthIndicator", "elasticsearchHealthContributor" })
+		HealthContributor elasticsearchHealthContributor(Map<String, RestClient> clients) {
+			return createContributor(clients);
+		}
+
+	}
+
+}

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/elasticsearch/ElasticsearchReactiveHealthContributorAutoConfigurationTests.java

@@ -50,6 +50,7 @@ class ElasticsearchReactiveHealthContributorAutoConfigurationTests {
 	}
 
 	@Test
+	@SuppressWarnings("deprecation")
 	void runWithRegularIndicatorShouldOnlyCreateReactiveIndicator() {
 		this.contextRunner
 				.withConfiguration(AutoConfigurations.of(ElasticSearchRestHealthContributorAutoConfiguration.class))

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/elasticsearch/ElasticsearchRestHealthContributorAutoConfigurationTests.java

@@ -0,0 +1,113 @@
+/*
+ * Copyright 2012-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.actuate.autoconfigure.elasticsearch;
+
+import org.elasticsearch.client.RestClient;
+import org.elasticsearch.client.RestClientBuilder;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.actuate.autoconfigure.health.HealthContributorAutoConfiguration;
+import org.springframework.boot.actuate.elasticsearch.ElasticsearchRestClientHealthIndicator;
+import org.springframework.boot.actuate.elasticsearch.ElasticsearchRestHealthIndicator;
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.autoconfigure.elasticsearch.ElasticsearchRestClientAutoConfiguration;
+import org.springframework.boot.test.context.FilteredClassLoader;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link ElasticsearchRestClientAutoConfiguration}.
+ *
+ * @author Filip Hrisafov
+ */
+class ElasticsearchRestHealthContributorAutoConfigurationTests {
+
+	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
+			.withConfiguration(AutoConfigurations.of(ElasticsearchRestClientAutoConfiguration.class,
+					ElasticSearchRestHealthContributorAutoConfiguration.class,
+					HealthContributorAutoConfiguration.class));
+
+	@Test
+	@SuppressWarnings("deprecation")
+	void runShouldCreateIndicator() {
+		this.contextRunner.run((context) -> assertThat(context).hasSingleBean(ElasticsearchRestHealthIndicator.class)
+				.hasBean("elasticsearchHealthContributor"));
+	}
+
+	@Test
+	void runWithoutRestHighLevelClientAndWithoutRestClientShouldNotCreateIndicator() {
+		this.contextRunner
+				.withClassLoader(
+						new FilteredClassLoader(org.elasticsearch.client.RestHighLevelClient.class, RestClient.class))
+				.run((context) -> assertThat(context).doesNotHaveBean(ElasticsearchRestClientHealthIndicator.class)
+						.doesNotHaveBean("elasticsearchHealthContributor"));
+	}
+
+	@Test
+	@SuppressWarnings("deprecation")
+	void runWithoutRestHighLevelClientAndWithRestClientShouldCreateIndicator() {
+		this.contextRunner.withUserConfiguration(CustomRestClientConfiguration.class)
+				.run((context) -> assertThat(context).hasSingleBean(ElasticsearchRestClientHealthIndicator.class)
+						.doesNotHaveBean(ElasticsearchRestHealthIndicator.class)
+						.hasBean("elasticsearchHealthContributor"));
+	}
+
+	@Test
+	@SuppressWarnings("deprecation")
+	void runWithRestHighLevelClientAndWithRestClientShouldCreateIndicator() {
+		this.contextRunner.withUserConfiguration(CustomRestHighClientConfiguration.class)
+				.run((context) -> assertThat(context).hasSingleBean(ElasticsearchRestClientHealthIndicator.class)
+						.hasBean("elasticsearchHealthContributor"));
+	}
+
+	@Test
+	void runWhenDisabledShouldNotCreateIndicator() {
+		this.contextRunner.withPropertyValues("management.health.elasticsearch.enabled:false")
+				.run((context) -> assertThat(context).doesNotHaveBean(ElasticsearchRestClientHealthIndicator.class)
+						.doesNotHaveBean("elasticsearchHealthContributor"));
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	static class CustomRestClientConfiguration {
+
+		@Bean
+		RestClient customRestClient(RestClientBuilder builder) {
+			return builder.build();
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	@SuppressWarnings("deprecation")
+	static class CustomRestHighClientConfiguration {
+
+		@Bean
+		org.elasticsearch.client.RestHighLevelClient customRestHighClient(RestClientBuilder builder) {
+			return new org.elasticsearch.client.RestHighLevelClient(builder);
+		}
+
+		@Bean
+		RestClient customClient(org.elasticsearch.client.RestHighLevelClient restHighLevelClient) {
+			return restHighLevelClient.getLowLevelClient();
+		}
+
+	}
+
+}

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/elasticsearch/ElasticsearchRestClientHealthIndicator.java

@@ -0,0 +1,85 @@
+/*
+ * Copyright 2012-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.actuate.elasticsearch;
+
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import java.util.Map;
+
+import org.apache.http.HttpStatus;
+import org.apache.http.StatusLine;
+import org.elasticsearch.client.Request;
+import org.elasticsearch.client.Response;
+import org.elasticsearch.client.RestClient;
+
+import org.springframework.boot.actuate.health.AbstractHealthIndicator;
+import org.springframework.boot.actuate.health.Health;
+import org.springframework.boot.actuate.health.HealthIndicator;
+import org.springframework.boot.json.JsonParser;
+import org.springframework.boot.json.JsonParserFactory;
+import org.springframework.util.StreamUtils;
+
+/**
+ * {@link HealthIndicator} for an Elasticsearch cluster using a {@link RestClient}.
+ *
+ * @author Artsiom Yudovin
+ * @author Brian Clozel
+ * @author Filip Hrisafov
+ * @since 2.7
+ */
+public class ElasticsearchRestClientHealthIndicator extends AbstractHealthIndicator {
+
+	private static final String RED_STATUS = "red";
+
+	private final RestClient client;
+
+	private final JsonParser jsonParser;
+
+	public ElasticsearchRestClientHealthIndicator(RestClient client) {
+		super("Elasticsearch health check failed");
+		this.client = client;
+		this.jsonParser = JsonParserFactory.getJsonParser();
+	}
+
+	@Override
+	protected void doHealthCheck(Health.Builder builder) throws Exception {
+		Response response = this.client.performRequest(new Request("GET", "/_cluster/health/"));
+		StatusLine statusLine = response.getStatusLine();
+		if (statusLine.getStatusCode() != HttpStatus.SC_OK) {
+			builder.down();
+			builder.withDetail("statusCode", statusLine.getStatusCode());
+			builder.withDetail("reasonPhrase", statusLine.getReasonPhrase());
+			return;
+		}
+		try (InputStream inputStream = response.getEntity().getContent()) {
+			doHealthCheck(builder, StreamUtils.copyToString(inputStream, StandardCharsets.UTF_8));
+		}
+	}
+
+	private void doHealthCheck(Health.Builder builder, String json) {
+		Map<String, Object> response = this.jsonParser.parseMap(json);
+		String status = (String) response.get("status");
+		if (RED_STATUS.equals(status)) {
+			builder.outOfService();
+		}
+		else {
+			builder.up();
+		}
+		builder.withDetails(response);
+	}
+
+}

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/elasticsearch/ElasticsearchRestHealthIndicator.java

@@ -16,22 +16,9 @@
 
 package org.springframework.boot.actuate.elasticsearch;
 
-import java.io.InputStream;
-import java.nio.charset.StandardCharsets;
-import java.util.Map;
-
-import org.apache.http.HttpStatus;
-import org.apache.http.StatusLine;
-import org.elasticsearch.client.Request;
-import org.elasticsearch.client.Response;
 import org.elasticsearch.client.RestClient;
 
-import org.springframework.boot.actuate.health.AbstractHealthIndicator;
-import org.springframework.boot.actuate.health.Health;
 import org.springframework.boot.actuate.health.HealthIndicator;
-import org.springframework.boot.json.JsonParser;
-import org.springframework.boot.json.JsonParserFactory;
-import org.springframework.util.StreamUtils;
 
 /**
  * {@link HealthIndicator} for an Elasticsearch cluster using a {@link RestClient}.
@@ -40,14 +27,11 @@ import org.springframework.util.StreamUtils;
  * @author Brian Clozel
  * @author Filip Hrisafov
  * @since 2.1.1
+ * @deprecated since 2.7.0 for removal in 2.9.0 in favor of
+ * {@link ElasticsearchRestClientHealthIndicator}
  */
-public class ElasticsearchRestHealthIndicator extends AbstractHealthIndicator {
-
-	private static final String RED_STATUS = "red";
-
-	private final RestClient client;
-
-	private final JsonParser jsonParser;
+@Deprecated
+public class ElasticsearchRestHealthIndicator extends ElasticsearchRestClientHealthIndicator {
 
 	@SuppressWarnings("deprecation")
 	public ElasticsearchRestHealthIndicator(org.elasticsearch.client.RestHighLevelClient client) {
@@ -55,36 +39,7 @@ public class ElasticsearchRestHealthIndicator extends AbstractHealthIndicator {
 	}
 
 	public ElasticsearchRestHealthIndicator(RestClient client) {
-		super("Elasticsearch health check failed");
-		this.client = client;
-		this.jsonParser = JsonParserFactory.getJsonParser();
-	}
-
-	@Override
-	protected void doHealthCheck(Health.Builder builder) throws Exception {
-		Response response = this.client.performRequest(new Request("GET", "/_cluster/health/"));
-		StatusLine statusLine = response.getStatusLine();
-		if (statusLine.getStatusCode() != HttpStatus.SC_OK) {
-			builder.down();
-			builder.withDetail("statusCode", statusLine.getStatusCode());
-			builder.withDetail("reasonPhrase", statusLine.getReasonPhrase());
-			return;
-		}
-		try (InputStream inputStream = response.getEntity().getContent()) {
-			doHealthCheck(builder, StreamUtils.copyToString(inputStream, StandardCharsets.UTF_8));
-		}
-	}
-
-	private void doHealthCheck(Health.Builder builder, String json) {
-		Map<String, Object> response = this.jsonParser.parseMap(json);
-		String status = (String) response.get("status");
-		if (RED_STATUS.equals(status)) {
-			builder.outOfService();
-		}
-		else {
-			builder.up();
-		}
-		builder.withDetails(response);
+		super(client);
 	}
 
 }

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/elasticsearch/ElasticsearchRestClientHealthIndicatorTests.java

@@ -0,0 +1,143 @@
+/*
+ * Copyright 2012-2019 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.actuate.elasticsearch;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.util.Map;
+
+import org.apache.http.StatusLine;
+import org.apache.http.entity.BasicHttpEntity;
+import org.elasticsearch.client.Request;
+import org.elasticsearch.client.Response;
+import org.elasticsearch.client.RestClient;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.actuate.health.Health;
+import org.springframework.boot.actuate.health.Status;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.entry;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+
+/**
+ * Tests for {@link ElasticsearchRestClientHealthIndicator}.
+ *
+ * @author Artsiom Yudovin
+ * @author Filip Hrisafov
+ */
+class ElasticsearchRestClientHealthIndicatorTests {
+
+	private final RestClient restClient = mock(RestClient.class);
+
+	private final ElasticsearchRestClientHealthIndicator elasticsearchRestHealthIndicator = new ElasticsearchRestClientHealthIndicator(
+			this.restClient);
+
+	@Test
+	void elasticsearchIsUp() throws IOException {
+		BasicHttpEntity httpEntity = new BasicHttpEntity();
+		httpEntity.setContent(new ByteArrayInputStream(createJsonResult(200, "green").getBytes()));
+		Response response = mock(Response.class);
+		StatusLine statusLine = mock(StatusLine.class);
+		given(statusLine.getStatusCode()).willReturn(200);
+		given(response.getStatusLine()).willReturn(statusLine);
+		given(response.getEntity()).willReturn(httpEntity);
+		given(this.restClient.performRequest(any(Request.class))).willReturn(response);
+		Health health = this.elasticsearchRestHealthIndicator.health();
+		assertThat(health.getStatus()).isEqualTo(Status.UP);
+		assertHealthDetailsWithStatus(health.getDetails(), "green");
+	}
+
+	@Test
+	void elasticsearchWithYellowStatusIsUp() throws IOException {
+		BasicHttpEntity httpEntity = new BasicHttpEntity();
+		httpEntity.setContent(new ByteArrayInputStream(createJsonResult(200, "yellow").getBytes()));
+		Response response = mock(Response.class);
+		StatusLine statusLine = mock(StatusLine.class);
+		given(statusLine.getStatusCode()).willReturn(200);
+		given(response.getStatusLine()).willReturn(statusLine);
+		given(response.getEntity()).willReturn(httpEntity);
+		given(this.restClient.performRequest(any(Request.class))).willReturn(response);
+		Health health = this.elasticsearchRestHealthIndicator.health();
+		assertThat(health.getStatus()).isEqualTo(Status.UP);
+		assertHealthDetailsWithStatus(health.getDetails(), "yellow");
+	}
+
+	@Test
+	void elasticsearchIsDown() throws IOException {
+		given(this.restClient.performRequest(any(Request.class))).willThrow(new IOException("Couldn't connect"));
+		Health health = this.elasticsearchRestHealthIndicator.health();
+		assertThat(health.getStatus()).isEqualTo(Status.DOWN);
+		assertThat(health.getDetails()).contains(entry("error", "java.io.IOException: Couldn't connect"));
+	}
+
+	@Test
+	void elasticsearchIsDownByResponseCode() throws IOException {
+		Response response = mock(Response.class);
+		StatusLine statusLine = mock(StatusLine.class);
+		given(statusLine.getStatusCode()).willReturn(500);
+		given(statusLine.getReasonPhrase()).willReturn("Internal server error");
+		given(response.getStatusLine()).willReturn(statusLine);
+		given(this.restClient.performRequest(any(Request.class))).willReturn(response);
+		Health health = this.elasticsearchRestHealthIndicator.health();
+		assertThat(health.getStatus()).isEqualTo(Status.DOWN);
+		assertThat(health.getDetails()).contains(entry("statusCode", 500),
+				entry("reasonPhrase", "Internal server error"));
+	}
+
+	@Test
+	void elasticsearchIsOutOfServiceByStatus() throws IOException {
+		BasicHttpEntity httpEntity = new BasicHttpEntity();
+		httpEntity.setContent(new ByteArrayInputStream(createJsonResult(200, "red").getBytes()));
+		Response response = mock(Response.class);
+		StatusLine statusLine = mock(StatusLine.class);
+		given(statusLine.getStatusCode()).willReturn(200);
+		given(response.getStatusLine()).willReturn(statusLine);
+		given(response.getEntity()).willReturn(httpEntity);
+		given(this.restClient.performRequest(any(Request.class))).willReturn(response);
+		Health health = this.elasticsearchRestHealthIndicator.health();
+		assertThat(health.getStatus()).isEqualTo(Status.OUT_OF_SERVICE);
+		assertHealthDetailsWithStatus(health.getDetails(), "red");
+	}
+
+	private void assertHealthDetailsWithStatus(Map<String, Object> details, String status) {
+		assertThat(details).contains(entry("cluster_name", "elasticsearch"), entry("status", status),
+				entry("timed_out", false), entry("number_of_nodes", 1), entry("number_of_data_nodes", 1),
+				entry("active_primary_shards", 0), entry("active_shards", 0), entry("relocating_shards", 0),
+				entry("initializing_shards", 0), entry("unassigned_shards", 0), entry("delayed_unassigned_shards", 0),
+				entry("number_of_pending_tasks", 0), entry("number_of_in_flight_fetch", 0),
+				entry("task_max_waiting_in_queue_millis", 0), entry("active_shards_percent_as_number", 100.0));
+	}
+
+	private String createJsonResult(int responseCode, String status) {
+		if (responseCode == 200) {
+			return String.format(
+					"{\"cluster_name\":\"elasticsearch\","
+							+ "\"status\":\"%s\",\"timed_out\":false,\"number_of_nodes\":1,"
+							+ "\"number_of_data_nodes\":1,\"active_primary_shards\":0,"
+							+ "\"active_shards\":0,\"relocating_shards\":0,\"initializing_shards\":0,"
+							+ "\"unassigned_shards\":0,\"delayed_unassigned_shards\":0,"
+							+ "\"number_of_pending_tasks\":0,\"number_of_in_flight_fetch\":0,"
+							+ "\"task_max_waiting_in_queue_millis\":0,\"active_shards_percent_as_number\":100.0}",
+					status);
+		}
+		return "{\n  \"error\": \"Server Error\",\n  \"status\": " + responseCode + "\n}";
+	}
+
+}

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/elasticsearch/ElasticsearchRestHealthIndicatorTests.java

@@ -42,6 +42,7 @@ import static org.mockito.Mockito.mock;
  * @author Artsiom Yudovin
  * @author Filip Hrisafov
  */
+@Deprecated
 class ElasticsearchRestHealthIndicatorTests {
 
 	private final RestClient restClient = mock(RestClient.class);

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/elasticsearch/ElasticsearchRestClientAutoConfiguration.java

@@ -22,7 +22,9 @@ import org.springframework.boot.autoconfigure.AutoConfiguration;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.elasticsearch.ElasticsearchRestClientConfigurations.RestClientBuilderConfiguration;
+import org.springframework.boot.autoconfigure.elasticsearch.ElasticsearchRestClientConfigurations.RestClientConfiguration;
 import org.springframework.boot.autoconfigure.elasticsearch.ElasticsearchRestClientConfigurations.RestClientSnifferConfiguration;
+import org.springframework.boot.autoconfigure.elasticsearch.ElasticsearchRestClientConfigurations.RestClientWithRestHighLevelClientConfiguration;
 import org.springframework.boot.autoconfigure.elasticsearch.ElasticsearchRestClientConfigurations.RestHighLevelClientConfiguration;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Import;
@@ -40,6 +42,7 @@ import org.springframework.context.annotation.Import;
 @EnableConfigurationProperties({ ElasticsearchProperties.class, ElasticsearchRestClientProperties.class,
 		DeprecatedElasticsearchRestClientProperties.class })
 @Import({ RestClientBuilderConfiguration.class, RestHighLevelClientConfiguration.class,
+		RestClientWithRestHighLevelClientConfiguration.class, RestClientConfiguration.class,
 		RestClientSnifferConfiguration.class })
 public class ElasticsearchRestClientAutoConfiguration {
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/elasticsearch/ElasticsearchRestClientConfigurations.java

@@ -36,6 +36,7 @@ import org.elasticsearch.client.sniff.SnifferBuilder;
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnSingleCandidate;
 import org.springframework.boot.context.properties.PropertyMapper;
 import org.springframework.context.annotation.Bean;
@@ -46,6 +47,7 @@ import org.springframework.util.StringUtils;
  * Elasticsearch rest client configurations.
  *
  * @author Stephane Nicoll
+ * @author Filip Hrisafov
  */
 class ElasticsearchRestClientConfigurations {
 
@@ -126,16 +128,41 @@ class ElasticsearchRestClientConfigurations {
 
 	@SuppressWarnings("deprecation")
 	@Configuration(proxyBeanMethods = false)
-	@ConditionalOnClass(Sniffer.class)
+	@ConditionalOnClass(org.elasticsearch.client.RestHighLevelClient.class)
 	@ConditionalOnSingleCandidate(org.elasticsearch.client.RestHighLevelClient.class)
+	@ConditionalOnMissingBean(RestClient.class)
+	static class RestClientWithRestHighLevelClientConfiguration {
+
+		@Bean
+		RestClient elasticsearchRestClient(org.elasticsearch.client.RestHighLevelClient restHighLevelClient) {
+			return restHighLevelClient.getLowLevelClient();
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	@ConditionalOnMissingClass("org.elasticsearch.client.RestHighLevelClient")
+	@ConditionalOnMissingBean(RestClient.class)
+	static class RestClientConfiguration {
+
+		@Bean
+		RestClient elasticsearchRestClient(RestClientBuilder restClientBuilder) {
+			return restClientBuilder.build();
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	@ConditionalOnClass(Sniffer.class)
+	@ConditionalOnSingleCandidate(RestClient.class)
 	static class RestClientSnifferConfiguration {
 
 		@Bean
 		@ConditionalOnMissingBean
-		Sniffer elasticsearchSniffer(org.elasticsearch.client.RestHighLevelClient client,
-				ElasticsearchRestClientProperties properties,
+		@SuppressWarnings("deprecation")
+		Sniffer elasticsearchSniffer(RestClient client, ElasticsearchRestClientProperties properties,
 				DeprecatedElasticsearchRestClientProperties deprecatedProperties) {
-			SnifferBuilder builder = Sniffer.builder(client.getLowLevelClient());
+			SnifferBuilder builder = Sniffer.builder(client);
 			PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull();
 			Duration interval = deprecatedProperties.isCustomized() ? deprecatedProperties.getSniffer().getInterval()
 					: properties.getSniffer().getInterval();

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/elasticsearch/ElasticsearchRestClientAutoConfigurationIntegrationTests.java

@@ -16,19 +16,26 @@
 
 package org.springframework.boot.autoconfigure.elasticsearch;
 
+import java.io.InputStream;
 import java.time.Duration;
 import java.util.HashMap;
 import java.util.Map;
 
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import org.elasticsearch.action.get.GetRequest;
 import org.elasticsearch.action.index.IndexRequest;
+import org.elasticsearch.client.Request;
 import org.elasticsearch.client.RequestOptions;
+import org.elasticsearch.client.Response;
+import org.elasticsearch.client.RestClient;
 import org.junit.jupiter.api.Test;
 import org.testcontainers.elasticsearch.ElasticsearchContainer;
 import org.testcontainers.junit.jupiter.Container;
 import org.testcontainers.junit.jupiter.Testcontainers;
 
 import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.test.context.FilteredClassLoader;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.boot.testsupport.testcontainers.DockerImageNames;
 
@@ -40,6 +47,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Brian Clozel
  * @author Vedran Pavic
  * @author Evgeniy Cheban
+ * @author Filip Hrisafov
  */
 @Testcontainers(disabledWithoutDocker = true)
 class ElasticsearchRestClientAutoConfigurationIntegrationTests {
@@ -53,7 +61,7 @@ class ElasticsearchRestClientAutoConfigurationIntegrationTests {
 
 	@Test
 	@SuppressWarnings("deprecation")
-	void restClientCanQueryElasticsearchNode() {
+	void restHighLevelClientCanQueryElasticsearchNode() {
 		this.contextRunner
 				.withPropertyValues("spring.elasticsearch.uris=" + elasticsearch.getHttpHostAddress(),
 						"spring.elasticsearch.connection-timeout=120s", "spring.elasticsearch.socket-timeout=120s")
@@ -70,4 +78,43 @@ class ElasticsearchRestClientAutoConfigurationIntegrationTests {
 				});
 	}
 
+	@Test
+	void restClientCanQueryElasticsearchNode() {
+		this.contextRunner
+				.withPropertyValues("spring.elasticsearch.uris=" + elasticsearch.getHttpHostAddress(),
+						"spring.elasticsearch.connection-timeout=120s", "spring.elasticsearch.socket-timeout=120s")
+				.run((context) -> {
+					RestClient client = context.getBean(RestClient.class);
+					Request index = new Request("PUT", "/test/_doc/2");
+					index.setJsonEntity("{" + "  \"a\": \"alpha\"," + "  \"b\": \"bravo\"" + "}");
+					client.performRequest(index);
+					Request getRequest = new Request("GET", "/test/_doc/2");
+					Response response = client.performRequest(getRequest);
+					try (InputStream input = response.getEntity().getContent()) {
+						JsonNode result = new ObjectMapper().readTree(input);
+						assertThat(result.path("found").asBoolean()).isTrue();
+					}
+				});
+	}
+
+	@Test
+	@SuppressWarnings("deprecation")
+	void restClientCanQueryElasticsearchNodeWithoutHighLevelClient() {
+		this.contextRunner.withClassLoader(new FilteredClassLoader(org.elasticsearch.client.RestHighLevelClient.class))
+				.withPropertyValues("spring.elasticsearch.uris=" + elasticsearch.getHttpHostAddress(),
+						"spring.elasticsearch.connection-timeout=120s", "spring.elasticsearch.socket-timeout=120s")
+				.run((context) -> {
+					RestClient client = context.getBean(RestClient.class);
+					Request index = new Request("PUT", "/test/_doc/3");
+					index.setJsonEntity("{" + "  \"a\": \"alpha\"," + "  \"b\": \"bravo\"" + "}");
+					client.performRequest(index);
+					Request getRequest = new Request("GET", "/test/_doc/3");
+					Response response = client.performRequest(getRequest);
+					try (InputStream input = response.getEntity().getContent()) {
+						JsonNode result = new ObjectMapper().readTree(input);
+						assertThat(result.path("found").asBoolean()).isTrue();
+					}
+				});
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/elasticsearch/ElasticsearchRestClientAutoConfigurationTests.java

@@ -63,17 +63,20 @@ class ElasticsearchRestClientAutoConfigurationTests {
 			.withConfiguration(AutoConfigurations.of(ElasticsearchRestClientAutoConfiguration.class));
 
 	@Test
-	void configureShouldOnlyCreateHighLevelRestClient() {
-		this.contextRunner.run((context) -> assertThat(context).doesNotHaveBean(RestClient.class)
-				.hasSingleBean(RestClientBuilder.class)
-				.hasSingleBean(org.elasticsearch.client.RestHighLevelClient.class));
-
+	void configureShouldCreateHighLevelAndLowLevelRestClient() {
+		this.contextRunner.run((context) -> {
+			assertThat(context).hasSingleBean(RestClient.class)
+					.hasSingleBean(org.elasticsearch.client.RestHighLevelClient.class)
+					.hasSingleBean(RestClientBuilder.class);
+			assertThat(context.getBean(RestClient.class))
+					.isEqualTo(context.getBean(org.elasticsearch.client.RestHighLevelClient.class).getLowLevelClient());
+		});
 	}
 
 	@Test
-	void configureWithoutRestHighLevelClientShouldOnlyCreateRestClientBuilder() {
+	void configureWithoutRestHighLevelClientShouldOnlyCreateRestClientBuilderAndRestClient() {
 		this.contextRunner.withClassLoader(new FilteredClassLoader(org.elasticsearch.client.RestHighLevelClient.class))
-				.run((context) -> assertThat(context).doesNotHaveBean(RestClient.class)
+				.run((context) -> assertThat(context).hasSingleBean(RestClient.class)
 						.doesNotHaveBean(org.elasticsearch.client.RestHighLevelClient.class)
 						.hasSingleBean(RestClientBuilder.class));
 	}
@@ -87,25 +90,52 @@ class ElasticsearchRestClientAutoConfigurationTests {
 						.hasBean("customRestClient"));
 	}
 
+	@Test
+	void configureWhenCustomRestHighLevelClientIsNotPresent() {
+		this.contextRunner.withClassLoader(new FilteredClassLoader(org.elasticsearch.client.RestHighLevelClient.class))
+				.run((context) -> assertThat(context)
+						.doesNotHaveBean(org.elasticsearch.client.RestHighLevelClient.class)
+						.hasSingleBean(RestClient.class).hasSingleBean(RestClientBuilder.class));
+	}
+
 	@Test
 	void configureWhenCustomRestHighLevelClientShouldBackOff() {
-		this.contextRunner.withUserConfiguration(CustomRestHighLevelClientConfiguration.class).run(
-				(context) -> assertThat(context).hasSingleBean(org.elasticsearch.client.RestHighLevelClient.class));
+		this.contextRunner.withUserConfiguration(CustomRestHighLevelClientConfiguration.class)
+				.run((context) -> assertThat(context).hasSingleBean(org.elasticsearch.client.RestHighLevelClient.class)
+						.hasSingleBean(RestClient.class).hasBean("elasticsearchRestClient"));
+	}
+
+	@Test
+	void configureWhenCustomRestHighLevelClientAndRestClientWithRestHighLevelClientShouldBackOff() {
+		this.contextRunner.withUserConfiguration(CustomRestHighLevelClientWithRestClientConfiguration.class)
+				.run((context) -> assertThat(context).hasSingleBean(org.elasticsearch.client.RestHighLevelClient.class)
+						.hasSingleBean(RestClient.class).hasBean("customRestClient"));
 	}
 
 	@Test
 	void configureWhenDefaultRestClientShouldCreateWhenNoUniqueRestHighLevelClient() {
 		this.contextRunner.withUserConfiguration(TwoCustomRestHighLevelClientConfiguration.class).run((context) -> {
+			assertThat(context).doesNotHaveBean(RestClient.class);
 			Map<String, org.elasticsearch.client.RestHighLevelClient> restHighLevelClients = context
 					.getBeansOfType(org.elasticsearch.client.RestHighLevelClient.class);
 			assertThat(restHighLevelClients).hasSize(2);
 		});
 	}
 
+	@Test
+	void configureWhenDefaultRestClientShouldCreateWhenNoUniqueRestClient() {
+		this.contextRunner.withClassLoader(new FilteredClassLoader(org.elasticsearch.client.RestHighLevelClient.class))
+				.withUserConfiguration(TwoCustomRestClientConfiguration.class).run((context) -> {
+					Map<String, RestClient> restClients = context.getBeansOfType(RestClient.class);
+					assertThat(restClients).hasSize(2);
+				});
+	}
+
 	@Test
 	void configureWhenBuilderCustomizerShouldApply() {
 		this.contextRunner.withUserConfiguration(BuilderCustomizerConfiguration.class).run((context) -> {
-			assertThat(context).hasSingleBean(org.elasticsearch.client.RestHighLevelClient.class);
+			assertThat(context).hasSingleBean(org.elasticsearch.client.RestHighLevelClient.class)
+					.hasSingleBean(RestClient.class);
 			org.elasticsearch.client.RestHighLevelClient restClient = context
 					.getBean(org.elasticsearch.client.RestHighLevelClient.class);
 			RestClient lowLevelClient = restClient.getLowLevelClient();
@@ -118,9 +148,8 @@ class ElasticsearchRestClientAutoConfigurationTests {
 	@Test
 	void configureWithNoTimeoutsApplyDefaults() {
 		this.contextRunner.run((context) -> {
-			assertThat(context).hasSingleBean(org.elasticsearch.client.RestHighLevelClient.class);
-			org.elasticsearch.client.RestHighLevelClient restClient = context
-					.getBean(org.elasticsearch.client.RestHighLevelClient.class);
+			assertThat(context).hasSingleBean(RestClient.class);
+			RestClient restClient = context.getBean(RestClient.class);
 			assertTimeouts(restClient, Duration.ofMillis(RestClientBuilder.DEFAULT_CONNECT_TIMEOUT_MILLIS),
 					Duration.ofMillis(RestClientBuilder.DEFAULT_SOCKET_TIMEOUT_MILLIS));
 		});
@@ -130,9 +159,8 @@ class ElasticsearchRestClientAutoConfigurationTests {
 	void configureWithLegacyCustomTimeouts() {
 		this.contextRunner.withPropertyValues("spring.elasticsearch.rest.connection-timeout=15s",
 				"spring.elasticsearch.rest.read-timeout=1m").run((context) -> {
-					assertThat(context).hasSingleBean(org.elasticsearch.client.RestHighLevelClient.class);
-					org.elasticsearch.client.RestHighLevelClient restClient = context
-							.getBean(org.elasticsearch.client.RestHighLevelClient.class);
+					assertThat(context).hasSingleBean(RestClient.class);
+					RestClient restClient = context.getBean(RestClient.class);
 					assertTimeouts(restClient, Duration.ofSeconds(15), Duration.ofMinutes(1));
 				});
 	}
@@ -141,25 +169,23 @@ class ElasticsearchRestClientAutoConfigurationTests {
 	void configureWithCustomTimeouts() {
 		this.contextRunner.withPropertyValues("spring.elasticsearch.connection-timeout=15s",
 				"spring.elasticsearch.socket-timeout=1m").run((context) -> {
-					assertThat(context).hasSingleBean(org.elasticsearch.client.RestHighLevelClient.class);
-					org.elasticsearch.client.RestHighLevelClient restClient = context
-							.getBean(org.elasticsearch.client.RestHighLevelClient.class);
+					assertThat(context).hasSingleBean(RestClient.class);
+					RestClient restClient = context.getBean(RestClient.class);
 					assertTimeouts(restClient, Duration.ofSeconds(15), Duration.ofMinutes(1));
 				});
 	}
 
-	private static void assertTimeouts(org.elasticsearch.client.RestHighLevelClient restClient, Duration connectTimeout,
-			Duration readTimeout) {
-		assertThat(restClient.getLowLevelClient()).extracting("client.defaultConfig.socketTimeout")
+	private static void assertTimeouts(RestClient restClient, Duration connectTimeout, Duration readTimeout) {
+		assertThat(restClient).extracting("client.defaultConfig.socketTimeout")
 				.isEqualTo(Math.toIntExact(readTimeout.toMillis()));
-		assertThat(restClient.getLowLevelClient()).extracting("client.defaultConfig.connectTimeout")
+		assertThat(restClient).extracting("client.defaultConfig.connectTimeout")
 				.isEqualTo(Math.toIntExact(connectTimeout.toMillis()));
 	}
 
 	@ParameterizedPropertyPrefixTest
 	void configureUriWithNoScheme(String prefix) {
 		this.contextRunner.withPropertyValues(prefix + "uris=localhost:9876").run((context) -> {
-			RestClient client = context.getBean(org.elasticsearch.client.RestHighLevelClient.class).getLowLevelClient();
+			RestClient client = context.getBean(RestClient.class);
 			assertThat(client.getNodes().stream().map(Node::getHost).map(HttpHost::toString))
 					.containsExactly("http://localhost:9876");
 		});
@@ -168,7 +194,7 @@ class ElasticsearchRestClientAutoConfigurationTests {
 	@ParameterizedPropertyPrefixTest
 	void configureUriWithUsernameOnly(String prefix) {
 		this.contextRunner.withPropertyValues(prefix + "uris=http://user@localhost:9200").run((context) -> {
-			RestClient client = context.getBean(org.elasticsearch.client.RestHighLevelClient.class).getLowLevelClient();
+			RestClient client = context.getBean(RestClient.class);
 			assertThat(client.getNodes().stream().map(Node::getHost).map(HttpHost::toString))
 					.containsExactly("http://localhost:9200");
 			assertThat(client)
@@ -184,7 +210,7 @@ class ElasticsearchRestClientAutoConfigurationTests {
 	@ParameterizedPropertyPrefixTest
 	void configureUriWithUsernameAndEmptyPassword(String prefix) {
 		this.contextRunner.withPropertyValues(prefix + "uris=http://user:@localhost:9200").run((context) -> {
-			RestClient client = context.getBean(org.elasticsearch.client.RestHighLevelClient.class).getLowLevelClient();
+			RestClient client = context.getBean(RestClient.class);
 			assertThat(client.getNodes().stream().map(Node::getHost).map(HttpHost::toString))
 					.containsExactly("http://localhost:9200");
 			assertThat(client)
@@ -201,8 +227,7 @@ class ElasticsearchRestClientAutoConfigurationTests {
 	void configureUriWithUsernameAndPasswordWhenUsernameAndPasswordPropertiesSet(String prefix) {
 		this.contextRunner.withPropertyValues(prefix + "uris=http://user:password@localhost:9200,localhost:9201",
 				prefix + "username=admin", prefix + "password=admin").run((context) -> {
-					RestClient client = context.getBean(org.elasticsearch.client.RestHighLevelClient.class)
-							.getLowLevelClient();
+					RestClient client = context.getBean(RestClient.class);
 					assertThat(client.getNodes().stream().map(Node::getHost).map(HttpHost::toString))
 							.containsExactly("http://localhost:9200", "http://localhost:9201");
 					assertThat(client)
@@ -224,7 +249,7 @@ class ElasticsearchRestClientAutoConfigurationTests {
 	@Test
 	void configureWithCustomPathPrefix() {
 		this.contextRunner.withPropertyValues("spring.elasticsearch.path-prefix=/some/prefix").run((context) -> {
-			RestClient client = context.getBean(org.elasticsearch.client.RestHighLevelClient.class).getLowLevelClient();
+			RestClient client = context.getBean(RestClient.class);
 			assertThat(client).extracting("pathPrefix").isEqualTo("/some/prefix");
 		});
 	}
@@ -233,19 +258,21 @@ class ElasticsearchRestClientAutoConfigurationTests {
 	void configureWithoutSnifferLibraryShouldNotCreateSniffer() {
 		this.contextRunner.withClassLoader(new FilteredClassLoader("org.elasticsearch.client.sniff"))
 				.run((context) -> assertThat(context).hasSingleBean(org.elasticsearch.client.RestHighLevelClient.class)
-						.doesNotHaveBean(Sniffer.class));
+						.hasSingleBean(RestClient.class).doesNotHaveBean(Sniffer.class));
 	}
 
 	@Test
-	void configureShouldCreateSnifferUsingRestHighLevelClient() {
-		this.contextRunner.run((context) -> {
-			assertThat(context).hasSingleBean(Sniffer.class);
-			assertThat(context.getBean(Sniffer.class)).hasFieldOrPropertyWithValue("restClient",
-					context.getBean(org.elasticsearch.client.RestHighLevelClient.class).getLowLevelClient());
-			// Validate shutdown order as the sniffer must be shutdown before the client
-			assertThat(context.getBeanFactory().getDependentBeans("elasticsearchRestHighLevelClient"))
-					.contains("elasticsearchSniffer");
-		});
+	void configureShouldCreateSnifferUsingRestClient() {
+		this.contextRunner.withClassLoader(new FilteredClassLoader(org.elasticsearch.client.RestHighLevelClient.class))
+				.run((context) -> {
+					assertThat(context).hasSingleBean(Sniffer.class);
+					assertThat(context.getBean(Sniffer.class)).hasFieldOrPropertyWithValue("restClient",
+							context.getBean(RestClient.class));
+					// Validate shutdown order as the sniffer must be shutdown before the
+					// client
+					assertThat(context.getBeanFactory().getDependentBeans("elasticsearchRestClient"))
+							.contains("elasticsearchSniffer");
+				});
 	}
 
 	@ParameterizedSnifferPropertyPrefixTest
@@ -309,6 +336,21 @@ class ElasticsearchRestClientAutoConfigurationTests {
 
 	}
 
+	@Configuration(proxyBeanMethods = false)
+	static class CustomRestHighLevelClientWithRestClientConfiguration {
+
+		@Bean
+		org.elasticsearch.client.RestHighLevelClient customRestHighLevelClient(RestClientBuilder builder) {
+			return new org.elasticsearch.client.RestHighLevelClient(builder);
+		}
+
+		@Bean
+		RestClient customRestClient(org.elasticsearch.client.RestHighLevelClient restHighLevelClient) {
+			return restHighLevelClient.getLowLevelClient();
+		}
+
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	static class TwoCustomRestHighLevelClientConfiguration {
 
@@ -334,6 +376,21 @@ class ElasticsearchRestClientAutoConfigurationTests {
 
 	}
 
+	@Configuration(proxyBeanMethods = false)
+	static class TwoCustomRestClientConfiguration {
+
+		@Bean
+		RestClient customRestClient(RestClientBuilder builder) {
+			return builder.build();
+		}
+
+		@Bean
+		RestClient customRestClient1(RestClientBuilder builder) {
+			return builder.build();
+		}
+
+	}
+
 	@ParameterizedTest
 	@Target(ElementType.METHOD)
 	@Retention(RetentionPolicy.RUNTIME)

spring-boot-project/spring-boot-docs/src/docs/asciidoc/data/nosql.adoc

@@ -269,14 +269,14 @@ You can use `spring.elasticsearch.*` properties to further tune how the clients
 ----
 
 [[data.nosql.elasticsearch.connecting-using-rest.restclient]]
-===== Connecting to Elasticsearch using RestHighLevelClient
-If you have `elasticsearch-rest-high-level-client` on the classpath, Spring Boot will auto-configure and register a `RestHighLevelClient` bean.
-In addition to the properties described previously, to fine-tune the `RestHighLevelClient`, you can register an arbitrary number of beans that implement `RestClientBuilderCustomizer` for more advanced customizations.
+===== Connecting to Elasticsearch using RestClient
+If you have `elasticsearch-rest-client` on the classpath, Spring Boot will auto-configure and register a `RestClient` bean.
+In addition to the properties described previously, to fine-tune the `RestClient`, you can register an arbitrary number of beans that implement `RestClientBuilderCustomizer` for more advanced customizations.
 To take full control over its registration, define a `RestClientBuilder` bean.
 
-TIP: If your application needs access to a "Low Level" `RestClient`, you can get it by calling `client.getLowLevelClient()` on the auto-configured `RestHighLevelClient`.
+NOTE: If you have `elasticsearch-rest-high-level-client` on the classpath a `RestHighLevelClient` bean will be exposed as well
 
-Additionally, if `elasticsearch-rest-client-sniffer` is on the classpath, a `Sniffer` is auto-configured to automatically discover nodes from a running Elasticsearch cluster and set them on the `RestHighLevelClient` bean.
+Additionally, if `elasticsearch-rest-client-sniffer` is on the classpath, a `Sniffer` is auto-configured to automatically discover nodes from a running Elasticsearch cluster and set them on the `RestClient` bean.
 You can further tune how `Sniffer` is configured, as shown in the following example:
 
 [source,yaml,indent=0,subs="verbatim",configprops,configblocks]