35 lines
2.2 KiB
Markdown
35 lines
2.2 KiB
Markdown
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---
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navigation_title: "Append"
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mapped_pages:
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- https://www.elastic.co/guide/en/elasticsearch/reference/current/append-processor.html
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---
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# Append processor [append-processor]
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Appends one or more values to an existing array if the field already exists and it is an array. Converts a scalar to an array and appends one or more values to it if the field exists and it is a scalar. Creates an array containing the provided values if the field doesn’t exist. Accepts a single value or an array of values.
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$$$append-options$$$
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| Name | Required | Default | Description |
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| --- | --- | --- | --- |
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| `field` | yes | - | The field to be appended to. Supports [template snippets](docs-content://manage-data/ingest/transform-enrich/ingest-pipelines.md#template-snippets). |
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| `value` | yes | - | The value to be appended. Supports [template snippets](docs-content://manage-data/ingest/transform-enrich/ingest-pipelines.md#template-snippets). |
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| `allow_duplicates` | no | true | If `false`, the processor does not appendvalues already present in the field. |
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| `media_type` | no | `application/json` | The media type for encoding `value`. Applies only when `value` is a[template snippet](docs-content://manage-data/ingest/transform-enrich/ingest-pipelines.md#template-snippets). Must be one of `application/json`, `text/plain`, or`application/x-www-form-urlencoded`. |
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| `description` | no | - | Description of the processor. Useful for describing the purpose of the processor or its configuration. |
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| `if` | no | - | Conditionally execute the processor. See [Conditionally run a processor](docs-content://manage-data/ingest/transform-enrich/ingest-pipelines.md#conditionally-run-processor). |
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| `ignore_failure` | no | `false` | Ignore failures for the processor. See [Handling pipeline failures](docs-content://manage-data/ingest/transform-enrich/ingest-pipelines.md#handling-pipeline-failures). |
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| `on_failure` | no | - | Handle failures for the processor. See [Handling pipeline failures](docs-content://manage-data/ingest/transform-enrich/ingest-pipelines.md#handling-pipeline-failures). |
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| `tag` | no | - | Identifier for the processor. Useful for debugging and metrics. |
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```js
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{
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"append": {
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"field": "tags",
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"value": ["production", "{{{app}}}", "{{{owner}}}"]
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}
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}
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```
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