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This version of the OpenSearch documentation is no longer maintained. For the latest version, see the current documentation. For information about OpenSearch version maintenance, see Release Schedule and Maintenance Policy.

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.


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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