elasticsearch/docs/reference/enrich-processor/lowercase-processor.md

---

navigation_title: "Lowercase" mapped_pages:

• https://www.elastic.co/guide/en/elasticsearch/reference/current/lowercase-processor.html ---

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.

$$$lowercase-options$$$

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
description	no	-	Description of the processor. Useful for describing the purpose of the processor or its configuration.
if	no	-	Conditionally execute the processor. See Conditionally run a processor.
ignore_failure	no	false	Ignore failures for the processor. See Handling pipeline failures.
on_failure	no	-	Handle failures for the processor. See Handling pipeline failures.
tag	no	-	Identifier for the processor. Useful for debugging and metrics.

{
  "lowercase": {
    "field": "foo"
  }
}