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028084ce23
This change adds a new merge policy that interleaves eldest and newest segments picked by MergePolicy#findForcedMerges and MergePolicy#findForcedDeletesMerges. This allows time-based indices, that usually have the eldest documents first, to be efficient at finding the most recent documents too. Although we wrap this merge policy for all indices even though it is mostly useful for time-based but there should be no overhead for other type of indices so it's simpler than adding a setting to enable it. This change is needed in order to ensure that the optimizations that we are working on in # remain efficient even after running a force merge. Relates #37043