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[Docs] Add note on limitation for significant_text with nested objects (#28052) 

Add section to `significant_text` documentation mentioning that it currently
does not support use on nested objects.

Relates to #28050
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Christoph Büscher 2018-01-03 16:28:23 +01:00 committed by GitHub
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docs/reference/aggregations/bucket/significanttext-aggregation.asciidoc
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@ -334,6 +334,12 @@ Clients can always take the heavily-trimmed set of results from a `significant_t
make a subsequent follow-up query using a `terms` aggregation with an `include` clause and child
aggregations to perform further analysis of selected keywords in a more efficient fashion.
===== No support for nested objects
The significant_text aggregation currently also cannot be used with text fields in
nested objects, because it works with the document JSON source. This makes this
feature inefficient when matching nested docs from stored JSON given a matching
Lucene docID.
===== Approximate counts
The counts of how many documents contain a term provided in results are based on summing the samples returned from each shard and