[PR] Add hook for LRUQueryCache to allow custom population strategies [lucene]

["dnhatn (via GitHub)" <gi...@apache.org>]

dnhatn opened a new pull request, #15733:
URL: https://github.com/apache/lucene/pull/15733

   In Elasticsearch, we execute intra-segment searches across multiple  threads, which can trigger redundant, concurrent cache populations for the same segment. Since each slice-search targets a subset of the segment but cache population scans the entire segment, this amplification significantly wastes I/O and CPU for expensive queries. This PR introduces a hook in LRUQueryCache to allow custom population strategies, such as delegating to a background thread or skipping redundant populations. There is no change to the default behavior of LRUQueryCache.
   


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Re: [PR] Add hook for LRUQueryCache to allow custom population strategies [lucene]

["dnhatn (via GitHub)" <gi...@apache.org>]

dnhatn merged PR #15733:
URL: https://github.com/apache/lucene/pull/15733


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