elasticsearch/docs/reference/scripting-languages/painless/painless-metric-agg-reduce-context.md

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mapped_pages:

• https://www.elastic.co/guide/en/elasticsearch/painless/current/painless-metric-agg-reduce-context.html products:
• id: painless ---

Metric aggregation reduce context [painless-metric-agg-reduce-context]

Use a Painless script to reduce values to produce the result of a scripted metric aggregation. A reduce script is run once on the coordinating node following a combine script (or a map script if no combine script is specified) and is optional as part of a full metric aggregation.

Variables

params (Map, read-only) : User-defined parameters passed in as part of the query.

states (Map) : Map with values available from the prior combine script (or a map script if no combine script is specified).

Return

List, Map, String, or primitive : A value used as the result.

API

The standard Painless API is available.