Lowercase Processor | Elasticsearch Reference [5.1]

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Lowercase Processoredit

Converts a string to its lowercase equivalent.

Table 24. Lowercase Options

Name	Required	Default	Description
`field`	yes	-	The field to make lowercase
`ignore_missing`	no	`false`	If `true` and `field` does not exist or is `null`, the processor quietly exits without modifying the document

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