[8.18] Re-enable parallel collection for field sorted top hits (#125916) #126011
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With elastic#123610 we disabled parallel collection for field and script sorted top hits, aligning its behaviour with that of top level search. This was mainly to work around a bug in script sorting that did not support inter-segment concurrency. The bug with script sort has been fixed with elastic#123757 and concurrency re-enabled for it. While sort by field is not optimized for search concurrency, top hits benefits from it and disabling concurrency for sort by field in top hits has caused performance regressions in our nightly benchmarks. This commit re-enables concurrency for top hits with sort by field is used. This introduces back a discrepancy between top level search and top hits, in that concurrency is applied for top hits despite sort by field normally disables it. The key difference is the context where sorting is applied, and the fact that concurrency is disabled only for performance reasons on top level searches and not for functional reasons.
javanna
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:Search Foundations/Search
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Backports the following commits to 8.18: