James Rodewig 3d44c1163a [DOCS] Explicitly document enrich target_field includes match_field (#49407)
When the enrich processor appends enrich data to an incoming document,
it adds a `target_field` to contain the enrich data.

This `target_field` contains both the `match_field` AND `enrich_fields`
specified in the enrich policy.

Previously, this was reflected in the documented example but not
explicitly stated. This adds several explicit statements to the docs.
2019-12-02 09:13:24 -05:00

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[role="xpack"]
[testenv="basic"]
[[enrich-processor]]
=== Enrich Processor
The `enrich` processor can enrich documents with data from another index.
See <<ingest-enriching-data,enrich data>> section for more information about how to set this up.
[[enrich-options]]
.Enrich Options
[options="header"]
|======
| Name | Required | Default | Description
| `policy_name` | yes | - | The name of the enrich policy to use.
| `field` | yes | - | The field in the input document that matches the policies match_field used to retrieve the enrichment data. Supports <<accessing-template-fields,template snippets>>.
| `target_field` | yes | - | Field added to incoming documents to contain enrich data. This field contains both the `match_field` and `enrich_fields` specified in the <<enrich-policy-definition,enrich policy>>. Supports <<accessing-template-fields,template snippets>>.
| `ignore_missing` | no | false | If `true` and `field` does not exist, the processor quietly exits without modifying the document
| `override` | no | true | If processor will update fields with pre-existing non-null-valued field. When set to `false`, such fields will not be touched.
| `max_matches` | no | 1 | The maximum number of matched documents to include under the configured target field. The `target_field` will be turned into a json array if `max_matches` is higher than 1, otherwise `target_field` will become a json object. In order to avoid documents getting too large, the maximum allowed value is 128.
| `shape_relation` | no | `INTERSECTS` | A spatial relation operator used to match the <<geo-shape,geo_shape>> of incoming documents to documents in the enrich index. This option is only used for `geo_match` enrich policy types. The <<spatial-strategy, geo_shape strategy>> mapping parameter determines which spatial relation operators are available. See <<_spatial_relations>> for operators and more information.
include::common-options.asciidoc[]
|======