Run CheckIndex on metadata index before loading (#73239) #74173
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The metadata index is small and important and only read at startup. Today we rely on Lucene to spot if any of its components is corrupt, but Lucene does not necesssarily verify all checksums in order to catch a corruption. With this commit we run `CheckIndex` on the metadata index first, and fail on startup if a corruption is detected. Closes elastic#29358
DaveCTurner
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The metadata index is small and important and only read at startup.
Today we rely on Lucene to spot if any of its components is corrupt, but
Lucene does not necesssarily verify all checksums in order to catch a
corruption. With this commit we run
CheckIndexon the metadata indexfirst, and fail on startup if a corruption is detected.
Closes #29358