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Script processor

This is an experimental feature and is not recommended for use in a production environment. For updates on the progress of the feature or if you want to leave feedback, join the discussion in the OpenSearch forum.

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.


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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