2018-07-02 17:44:36 -04:00
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[[painless-metric-agg-reduce-context]]
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=== Metric aggregation reduce context
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Use a Painless script to
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2018-07-25 13:59:25 -04:00
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{ref}/search-aggregations-metrics-scripted-metric-aggregation.html[reduce]
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2018-07-02 17:44:36 -04:00
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values to produce the result of a scripted metric aggregation. A reduce script
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is run once on the coordinating node following a
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<<painless-metric-agg-combine-context, combine script>> (or a
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<<painless-metric-agg-map-context, map script>> if no combine script is
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specified) and is optional as part of a full metric aggregation.
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*Variables*
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`params` (`Map`, read-only)::
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User-defined parameters passed in as part of the query.
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`params['_aggs']` (`Map`)::
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`Map` with values available from the prior combine script (or a map
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script if no combine script is specified).
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*Return*
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`List`, `Map`, `String`, or primitive::
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A value used as the result.
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*API*
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The standard <<painless-api-reference, Painless API>> is available.
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