[8.8] Fix reused/recovered bytes for files that are only partially recovered from cache (#95987) #97103
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…d from cache (elastic#95987) Before elastic#95891 a file was considered as reused in recovery if it was fully cached in the cold persistent cache. Otherwise the full file length was reported as recovered from the blob store during prewarming. While working on elastic#95891 I changed the CachedBlobContainerIndexInput.prefetchPart() method to be more precise on the number of bytes that were effectively read from the blob store during prewarming. But this obviously broke some tests (elastic#95970) because a file cannot be partially recovered from disk and from remote. This change restores the previous behavior with one adjustment: the file is considered as reused if the prewarm method effectively prefetched 0 bytes. Closes elastic#95970 Closes elastic#95994
tlrx added :Distributed Coordination/Snapshot/Restore 
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Backports the following commits to 8.8: