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Trim processor

Trims whitespace from field. If the field is an array of strings, all members of the array will be trimmed.

This only works on leading and trailing whitespace.

Table 40. Trim Options

Name	Required	Default	Description
`field`	yes	-	The string-valued field to trim whitespace from
`target_field`	no	`field`	The field to assign the trimmed value to, by default `field` is updated in-place
`ignore_missing`	no	`false`	If `true` and `field` does not exist, 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.

{
  "trim": {
    "field": "foo"
  }
}

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https://www.elastic.co/guide/en/elasticsearch/reference/7.17/trim-processor.html