markharwood b7197f5e21 SignificantText aggregation - like significant_terms, but for text (#24432)
* SignificantText aggregation - like significant_terms but doesn’t require fielddata=true, recommended used with `sampler` agg to limit expense of tokenizing docs and takes optional `filter_duplicate_text`:true setting to avoid stats skew from repeated sections of text in search results.

Closes #23674
2017-05-24 13:46:43 +01:00
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