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Backports the following commits to 9.1:

…ndThenCatchesUp (elastic#131636)

This addresses an unfounded test assumption that a merge following refreshes is a noop.
Refreshes might trigger a merge, but segments can be part of a single merge task at a time so it's possible that after multiple independent merges finish, if the TieredMergePolicy is invoked again it might still find yet another merge to run.

Fixes elastic#131262
@albertzaharovits albertzaharovits added :Distributed Indexing/Engine Anything around managing Lucene and the Translog in an open shard. >test Issues or PRs that are addressing/adding tests auto-merge-without-approval Automatically merge pull request when CI checks pass (NB doesn't wait for reviews!) backport Team:Distributed Indexing Meta label for Distributed Indexing team labels Jul 22, 2025
@elasticsearchmachine elasticsearchmachine merged commit 5004e39 into elastic:9.1 Jul 22, 2025
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@albertzaharovits albertzaharovits deleted the backport/9.1/pr-131636 branch July 22, 2025 08:36
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auto-merge-without-approval Automatically merge pull request when CI checks pass (NB doesn't wait for reviews!) backport :Distributed Indexing/Engine Anything around managing Lucene and the Translog in an open shard. Team:Distributed Indexing Meta label for Distributed Indexing team >test Issues or PRs that are addressing/adding tests v9.1.1

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