[7.x] Refactor ForEachProcessor to use iteration instead of recursion (#51104) #51322
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…tic#51104) * Refactor ForEachProcessor to use iteration instead of recursion This change makes ForEachProcessor iterative and still non-blocking. In case of non-async processors we use single for loop and no recursion at all. In case of async processors we continue work on either current thread or thread started by downstream processor, whichever is slower (usually processor thread). Everything is synchronised by single atomic variable. Relates elastic#50514
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Backports the following commits to 7.x: