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fcc7f553f5
With this commit we add the `.cfs` file extension to the list of file types that are memory-mapped by hybridfs. `.cfs` files combine all files of a Lucene segment into a single file in order to save file handles. As this strategy is only used for "small" segments (less than 10% of the shard size), it is benefical to memory-map them instead of accessing them via NIO. Relates #36668