Script processor
- Request fields
- Example

Script processor

The script search request processor intercepts a search request and adds an inline Painless script that is run on incoming requests. The script can only run on the following request fields:

from
size
explain
version
seq_no_primary_term
track_scores
track_total_hits
min_score
terminate_after
profile

For request field definitions, see search request fields.

Request fields

The following table lists all available request fields.

Field	Data type	Description
`source`	Inline script	The script to run. Required.
`lang`	String	The script language. Optional. Only `painless` is supported.
`tag`	String	The processor’s identifier. Optional.
`description`	String	A description of the processor. Optional.
`ignore_failure`	Boolean	If `true`, OpenSearch ignores a failure of this processor and continues to run the remaining processors in the search pipeline. Optional. Default is `false`.

Example

The following request creates a search pipeline with a script request processor. The script limits score explanation to only one document because explain is an expensive operation:

PUT /_search/pipeline/explain_one_result
{
  "description": "A pipeline to limit the explain operation to one result only",
  "request_processors": [
    {
      "script": {
        "lang": "painless",
        "source": "if (ctx._source['size'] > 1) { ctx._source['explain'] = false } else { ctx._source['explain'] = true }"
      }
    }
  ]
}

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