Honour max segment size when setting only_expunge_deletes on force merge #77692
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…rge (elastic#77478) This commit changes the es merge policy to apply the maximum segment size on force merges that only expunge deletes (forceMergeDeletes). This option is useful for read-write use cases that wants to reclaim deleted docs more aggressively than the `index.merge.policy.deletes_pct_allowed`. Closes elastic#61764 Relates elastic#77270
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Backport of #77478