[9.3] Fix system index mapping update for reindexed indices after migration (#144782)#145025
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alexey-ivanov-es merged 1 commit intoelastic:9.3from Mar 26, 2026
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…elastic#144782) SystemIndexMappingUpdateService used projectMetadata.hasIndexAbstraction(d.getPrimaryIndex()) to collect system indices descriptors to check mappings, but then used state.metadata().index(descriptor.getPrimaryIndex()) to get IndexMetadata. This works with indices that were not reindexed, since their name is always the same as the system index's primary name, but after reindexing during migration, the index gains -reindexed-for-<version> suffix and has an alias with the primary name pointing to it. However, index method doesn't support aliases, therefore, IndexMetadata wasn't resolved and mappings were not checked. This change fixes that by introducing use of indices lookup, if there is no metadata for the primary index.
alexey-ivanov-es
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:Core/Infra/System Indices
>bug
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Backports the following commits to 9.3: