[7.x] Store _doc_count field as custom term frequency#65825
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csoulios merged 1 commit intoelastic:7.xfrom Dec 3, 2020
Merged
[7.x] Store _doc_count field as custom term frequency#65825csoulios merged 1 commit intoelastic:7.xfrom
csoulios merged 1 commit intoelastic:7.xfrom
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A while back, Lucene introduced the ability to index custom term frequencies, ie. giving users the ability to provide a numeric value that should be indexed as a term frequency rather than letting Lucene compute the term frequency by itself based on the number of occurrences of a term. This PR modifies the _doc_count field so that it is stored as Lucene custom term frequency. A benefit of moving to custom term frequencies is that Lucene will automatically compute global term statistics like totalTermFreq which will let us know the sum of the values of the _doc_count field across an entire shard. This could in-turn be useful to generalize optimizations to rollup indices, e.g. buckets aggregations where all documents fall into the same bucket. Relates to elastic#64503
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Backports #65776 to 7.x