Processors - Trim - 《Elasticsearch v7.9 Reference》

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 36. 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
`if`	no	-	Conditionally execute this processor.
`on_failure`	no	-	Handle failures for this processor. See Handling Failures in Pipelines.
`ignore_failure`	no	`false`	Ignore failures for this processor. See Handling Failures in Pipelines.
`tag`	no	-	An identifier for this processor. Useful for debugging and metrics.

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