OpenSearch/docs/reference/ingest/processors/append.asciidoc

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[[append-processor]]
=== Append processor
++++
<titleabbrev>Append</titleabbrev>
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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.
[[append-options]]
.Append Options
[options="header"]
|======
| Name | Required | Default | Description
| `field` | yes | - | The field to be appended to. Supports <<accessing-template-fields,template snippets>>.
| `value` | yes | - | The value to be appended. Supports <<accessing-template-fields,template snippets>>.
include::common-options.asciidoc[]
|======
[source,js]
--------------------------------------------------
{
"append": {
"field": "tags",
"value": ["production", "{{app}}", "{{owner}}"]
}
}
--------------------------------------------------
// NOTCONSOLE