[8.x] Add min. read-only index version compatible to DiscoveryNode (#118744)#118884
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elasticsearchmachine merged 2 commits intoelastic:8.xfrom Dec 17, 2024
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…lastic#118744) In a short future we'd like to use this information in methods like IndexMetadataVerifier#checkSupportedVersion and NodeJoineExecutor to allow opening indices in N-2 versions as read-only indices on ES V9.
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…118923) This is the backport of #118941 for 8.18. This change relaxes the index compatibility version checks to allow archive and searchable snapshot indices in version N-2 to exist on a 9.x cluster. It uses the min. read-only index compatible version added in #118884 to accept join requests from 9.x nodes that can read indices created in version 7.x (N-2) as long as they have a write block and are either archive or searchable snapshot indices. Relates ES-10274
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Backport of #118744 for 8.18