33 lines
934 B
Plaintext
33 lines
934 B
Plaintext
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[[painless-metric-agg-init-context]]
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=== Metric aggregation initialization context
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Use a Painless script to
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{es_version}/search-aggregations-metrics-scripted-metric-aggregation.html[initialize]
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values for use in a scripted metric aggregation. An initialization script is
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run prior to document collection once per shard and is optional as part of the
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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['_agg']` (`Map`)::
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Empty `Map` used to add values for use in a
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<<painless-metric-agg-map-context, map script>>.
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*Side Effects*
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`params['_agg']` (`Map`)::
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Add values to this `Map` to for use in a map. Additional values must
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be of the type `Map`, `List`, `String` or primitive.
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*Return*
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`void`::
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No expected return value.
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*API*
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The standard <<painless-api-reference, Painless API>> is available.
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