[7.x] Add data tiers (hot, warm, cold, frozen) as custom node roles (#60994) #61045
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…c#60994) This commit adds the `data_hot`, `data_warm`, `data_cold`, and `data_frozen` node roles to the x-pack plugin. These roles are intended to be the base for the formalization of data tiers in Elasticsearch. These roles all act as data nodes (meaning shards can be allocated to them). Nodes with the existing `data` role acts as though they have all of the roles configured (it is a hot, warm, cold, and frozen node). This also includes a custom `AllocationDecider` that allows the user to configure the following settings on a cluster level: - `cluster.routing.allocation.require._tier` - `cluster.routing.allocation.include._tier` - `cluster.routing.allocation.exclude._tier` And in index settings: - `index.routing.allocation.require._tier` - `index.routing.allocation.include._tier` - `index.routing.allocation.exclude._tier` Relates to elastic#60848
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Backports the following commits to 7.x: