Fix segment-specific TermInSetQuery rewrites thrashing caching policy #15441
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Fixes apache#14986. A `TermInSetQuery` with `rewriteMethod = MultiTermQuery.CONSTANT_SCORE_BLENDED_REWRITE` creates a `RewritingWeight`. Getting a scorer from this `RewritingWeight` for a segment could involve rewriting to a `BooleanQuery` of multiple `TermQuery` with only the terms present in that particular segment. These segment-specific `BooleanQuery` rewrites all thrash the `UsageTrackingQueryCachingPolicy` ring buffer, which is shared across all segments of the index. The expectation is that we mark a query only once per shard in this ring buffer - [ref](https://github.com/apache/lucene/blob/a3fa283cfd6aefbcc5a4983e065da0ce7d3209fe/lucene/core/src/java/org/apache/lucene/search/LRUQueryCache.java#L686-L688) In this change: When initializing `AbstractMultiTermQueryConstantScoreWrapper.RewritingWeight`, we copy the supplied indexSearcher but with `setQueryCache(null)` and pass it along for the segment-specific rewrites.
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Description
Fixes #14986.
A
TermInSetQuerywithrewriteMethod = MultiTermQuery.CONSTANT_SCORE_BLENDED_REWRITEcreates aRewritingWeight. Getting a scorer from thisRewritingWeightfor a segment could involve rewriting to aBooleanQueryof multipleTermQuerywith only the terms present in that particular segment.These segment-specific
BooleanQueryrewrites all thrash theUsageTrackingQueryCachingPolicyring buffer, which is shared across all segments of the index. The expectation is that we mark a query only once per shard in this ring buffer - refIn this change: When initializing
AbstractMultiTermQueryConstantScoreWrapper.RewritingWeight, we copy the supplied indexSearcher but withsetQueryCache(null)and pass it along for the segment-specific rewrites. The subsequent rewrites into BooleanQuery of TermQuery don't go through the query cache (The idea is that these should be cached as the parent TermInSet query itself)