Add property to configure Mongo auto index creation

Closes gh-16454

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/mongo/MongoDataConfiguration.java

@@ -21,6 +21,7 @@ import org.springframework.beans.BeanUtils;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.domain.EntityScanner;
 import org.springframework.boot.autoconfigure.mongo.MongoProperties;
+import org.springframework.boot.context.properties.PropertyMapper;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -34,6 +35,7 @@ import org.springframework.data.mongodb.core.mapping.MongoMappingContext;
  * Base configuration class for Spring Data's mongo support.
  *
  * @author Madhura Bhave
+ * @author Artsiom Yudovin
  */
 @Configuration(proxyBeanMethods = false)
 class MongoDataConfiguration {
@@ -43,7 +45,9 @@ class MongoDataConfiguration {
 	public MongoMappingContext mongoMappingContext(ApplicationContext applicationContext,
 			MongoProperties properties, MongoCustomConversions conversions)
 			throws ClassNotFoundException {
+		PropertyMapper mapper = PropertyMapper.get().alwaysApplyingWhenNonNull();
 		MongoMappingContext context = new MongoMappingContext();
+		mapper.from(properties.isAutoIndexCreation()).to(context::setAutoIndexCreation);
 		context.setInitialEntitySet(new EntityScanner(applicationContext)
 				.scan(Document.class, Persistent.class));
 		Class<?> strategyClass = properties.getFieldNamingStrategy();

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mongo/MongoProperties.java

@@ -31,6 +31,7 @@ import org.springframework.boot.context.properties.ConfigurationProperties;
  * @author Stephane Nicoll
  * @author Nasko Vasilev
  * @author Mark Paluch
+ * @author Artsiom Yudovin
  */
 @ConfigurationProperties(prefix = "spring.data.mongodb")
 public class MongoProperties {
@@ -90,6 +91,11 @@ public class MongoProperties {
 	 */
 	private Class<?> fieldNamingStrategy;
 
+	/**
+	 * Enables/disables auto-index creation.
+	 */
+	private Boolean autoIndexCreation;
+
 	public String getHost() {
 		return this.host;
 	}
@@ -173,4 +179,12 @@ public class MongoProperties {
 		return new MongoClientURI(determineUri()).getDatabase();
 	}
 
+	public Boolean isAutoIndexCreation() {
+		return this.autoIndexCreation;
+	}
+
+	public void setAutoIndexCreation(Boolean autoIndexCreation) {
+		this.autoIndexCreation = autoIndexCreation;
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/data/mongo/MongoDataAutoConfigurationTests.java

@@ -132,6 +132,18 @@ public class MongoDataAutoConfigurationTests {
 				});
 	}
 
+	@Test
+	public void customAutoIndexCreation() {
+		this.contextRunner
+				.withPropertyValues("spring.data.mongodb.autoIndexCreation:true")
+				.run((context) -> {
+					MongoMappingContext mappingContext = context
+							.getBean(MongoMappingContext.class);
+					assertThat(mappingContext.isAutoIndexCreation())
+							.isEqualTo(Boolean.TRUE);
+				});
+	}
+
 	@Test
 	public void interfaceFieldNamingStrategy() {
 		this.contextRunner

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoPropertiesTests.java

@@ -37,6 +37,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Andy Wilkinson
  * @author Stephane Nicoll
  * @author Mark Paluch
+ * @author Artsiom Yudovin
  */
 public class MongoPropertiesTests {
 
@@ -155,6 +156,17 @@ public class MongoPropertiesTests {
 		assertServerAddress(allAddresses.get(0), "localhost", 27017);
 	}
 
+	@Test
+	public void canBindAutoIndexCreation() {
+		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
+		TestPropertyValues.of("spring.data.mongodb.autoIndexCreation:true")
+				.applyTo(context);
+		context.register(Config.class);
+		context.refresh();
+		MongoProperties properties = context.getBean(MongoProperties.class);
+		assertThat(properties.isAutoIndexCreation()).isEqualTo(Boolean.TRUE);
+	}
+
 	private void assertServerAddress(ServerAddress serverAddress, String expectedHost,
 			int expectedPort) {
 		assertThat(serverAddress.getHost()).isEqualTo(expectedHost);