[9.1] Remove ILM-stopped-check before the cluster update in migrateToDataTiersRouting (#140885) (#140892)#140950
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elasticsearchmachine merged 1 commit intoelastic:9.1from Jan 20, 2026
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…iersRouting` (elastic#140885) (elastic#140892) In order to run the migrate data tiers request, we need to ensure that ILM is stopped. In the `TransportMigrateToDataTiersAction` we performed this check twice: 1. The first time was when the API was called to avoid creating cluster state updates that were bound to fail. 2. The second time was during the cluster state update, to ensure that the cluster state has the correct conditions when applying the change. It is possible that the first check is applied on an outdated cluster state causing the request to fail while it could succeed. In this PR, considering the usage patterns of this API, we believe the benefit of the first check is very small, so we keep only the second which is the up-to-date one. Relevant test: https://github.com/elastic/elasticsearch/blob/main/x-pack/plugin/ilm/qa/multi-node/src/javaRestTest/java/org/elasticsearch/xpack/MigrateToDataTiersIT.java#L82-L87 Fixes elastic#140885
gmarouli
added
:StorageEngine/ILM
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Backports the following commits to 9.1:
migrateToDataTiersRouting(GET _ilm/statusreturnsSTOPPEDbefore it's safe to runPOST _ilm/migrate_to_data_tiers#140885) (Remove ILM-stopped-check before the cluster update inmigrateToDataTiersRouting(#140885) #140892)