[8.x] Avoid creating IndexSearcher in Engine.refreshNeeded (#123218) #123257
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Checking whether we need to refresh does not require a searcher so we can simplify this to just work based on the reader and avoid lots of contention etc. for setting up the searcher. relates elastic#122374
original-brownbear
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:Distributed Indexing/Engine
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Backports the following commits to 8.x: