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[DOCS] Clarify behaviour of scripted-metric arg with empty parent buckets

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Colin Goodheart-Smithe 2017-06-02 11:00:27 +01:00
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6
docs/reference/aggregations/metrics/scripted-metric-aggregation.asciidoc
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@ -278,3 +278,9 @@ params:: Optional. An object whose contents will be passed as variable
"_agg" : {}
}
--------------------------------------------------
==== Empty Buckets
If a parent bucket of the scripted metric aggregation does not collect any documents an empty aggregation response will be returned from the
shard with a `null` value. In this case the `reduce_script`'s `_aggs` variable will contain `null` as a response from that shard.
`reduce_script`'s should therefore expect and deal with `null` responses from shards.