[8.19] Avoid some uses of ConcurrentLinkedQueue.size() in SharedBlobCacheService (#128119) (#128194) #128203
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…vice (elastic#128119) (elastic#128194) SharedBlobCacheService keeps track of the free regions in a ConcurrentLinkedQueue. We use its "size()" method in three places outside of tests but unfortunately this is not a constant time operation because of the asynchronous nature of this queue. This change removes two of the uses where we only check if the queue is empty by calling the "isEmpty()" method instead.
cbuescher
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:Distributed Indexing/Distributed
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Backports the following commits to 8.19: