Allow aggs to disable offloading sequential collection #98276
Merged
Commits on Aug 8, 2023
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Allow aggs to disable offloading sequential collection
In elastic#98204 we are introducing unconditional offloading of collection to a separate thread pool, even for requests of phases that don't enable search concurrency. It turns out that some aggs don't support offloading their collection to a separate thread, as their postCollect method is executed on the search thread which trips a lucene assertion around reusing data structures pulled from the search worker thread. With this commit we allow aggs to specify when they don't support offloading their sequential collection. Such aggs are a subset of the ones that already declare that they don't support concurrency entirely. Relates to elastic#96023
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