[7.x] Add DiscoveryNodeRole compatibility role for bwc tier serialization (#63581) #63612
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…lastic#63581) When introducing new roles, older versions of Elasticsearch aren't aware of these roles. This can lead to a situation where an old (say 7.9.x) master node sees nodes in the cluster of version 7.10+ with "data_hot" or "data_content" roles, and thinks those roles are not eligible to hold data (since the older node has no concept of these roles). This adds a method to `DiscoveryNodeRole` where a role can return a compatibility role to be used for serializing to an older Elasicsearch version. The new formalized data tier roles (`data_content`, `data_hot`, `data_warm`, `data_cold`) uses this mechanism to serialize as regular "data" roles when talking to an older Elasticsearch node. This will allow these nodes to still contain data during a rolling upgrade where the master is upgraded last. Relates to elastic#60848
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Pinging @elastic/es-core-features (:Core/Features/Features) |
elasticmachine
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Backports the following commits to 7.x: