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Document that pipeline aggs are not compatible with composite agg (#44180)

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Zachary Tong 2019-07-12 12:34:34 -04:00
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docs/reference/aggregations/bucket/composite-aggregation.asciidoc
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@ -590,3 +590,13 @@ GET /_search
} }
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// TESTRESPONSE[s/\.\.\.//] // TESTRESPONSE[s/\.\.\.//]
==== Pipeline aggregations
The composite agg is not currently compatible with pipeline aggregations, nor does it make sense in most cases.
E.g. due to the paging nature of composite aggs, a single logical partition (one day for example) might be spread
over multiple pages. Since pipeline aggregations are purely post-processing on the final list of buckets,
running something like a derivative on a composite page could lead to inaccurate results as it is only taking into
account a "partial" result on that page.
Pipeline aggs that are self contained to a single bucket (such as `bucket_selector`) might be supported in the future.