elasticsearch/docs/reference/ingest/processors/join.asciidoc

[[join-processor]]
=== Join Processor
Joins each element of an array into a single string using a separator character between each element.
Throws an error when the field is not an array.

[[join-options]]
.Join Options
[options="header"]
|======
| Name              | Required  | Default  | Description
| `field`           | yes       | -        | The field to be separated
| `separator`       | yes       | -        | The separator character
| `target_field`    | no        | `field`  | The field to assign the joined value to, by default `field` is updated in-place
include::common-options.asciidoc[]
|======

[source,js]
--------------------------------------------------
{
  "join": {
    "field": "joined_array_field",
    "separator": "-"
  }
}
--------------------------------------------------
// NOTCONSOLE