[8.x] Speed up InternalEngine#resolveDocVersion(...) method (#122374) #122641
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Use reference manager to get index reader instead of acquiring a searcher. The latter involves creating an index searcher, which is not used and expensive as part of the `resolveDocVersion(...)` method, because this method is invoked for each document that gets indexed.
martijnvg
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:Distributed Indexing/Engine
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Backports the following commits to 8.x: