Describe the bug

• Update the shortcutTotalHitCount logic to identify the query as MatchAllDocsQuery.class.

• Today with approximation the match_all is converted to a range query. With this the totalHitsThreshold coming from Lucene TopFieldCollector is changed to 10k.

• For match_all the threshold should be 10 (the numHits value) which is coming from TopDocsCollectorContext part of OpenSearch.

• With totalHitsThreshold as 10k, with large threshold this is delaying the updateCompetitiveIterator process part of the Lucene NumericComparator and forcing to compare all the 10k docs.

• With the default 10, the competitive iterator would have updated early and could eliminate some docs from 10k.

• This fixed the inconsistency because now the total hit count correctly includes all documents that would match a true match_all query, even when the query has been optimized into a range query on the sort field.

• Should fix the [AUTOCUT] Gradle Check Flaky Test Report for SimpleSearchIT #16851

Related component

Search:Performance

To Reproduce

N/A

Expected behavior

This should improve the performance for match_all queries that go with approximation as the Lucene competitive iterator would trigger early. Benchmark results #18189 (comment).

This change should also bring the behavior in line with what users expect when running a match_all query with sorting to include the documents that was missing the sort field.

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