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This commit adds the `index.routing.allocation.prefer._tier` setting to the `DataTierAllocationDecider`. This special-purpose allocation setting lets a user specify a preference-based list of tiers for an index to be assigned to. For example, if the setting were set to: ``` "index.routing.allocation.prefer._tier": "data_hot,data_warm,data_content" ``` If the cluster contains any nodes with the `data_hot` role, the decider will only allow them to be allocated on the `data_hot` node(s). If there are no `data_hot` nodes, but there are `data_warm` and `data_content` nodes, then the index will be allowed to be allocated on `data_warm` nodes. This allows us to specify an index's preference for tier(s) without causing the index to be unassigned if no nodes of a preferred tier are available. Subsequent work will change the ILM migration to make additional use of this setting. Relates to #60848
Elastic License Functionality
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