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

[[lowercase-processor]]
=== Lowercase Processor
Converts a string to its lowercase equivalent. If the field is an array of strings, all members of the array will be converted.

[[lowercase-options]]
.Lowercase Options
[options="header"]
|======
| Name             | Required  | Default  | Description
| `field`          | yes       | -        | The field to make lowercase
| `target_field`   | no        | `field`  | The field to assign the converted value to, by default `field` is updated in-place
| `ignore_missing` | no        | `false`  | If `true` and `field` does not exist or is `null`, the processor quietly exits without modifying the document
include::common-options.asciidoc[]
|======

[source,js]
--------------------------------------------------
{
  "lowercase": {
    "field": "foo"
  }
}
--------------------------------------------------
// NOTCONSOLE