Add cache support in TransportGetAllocationStatsAction (#124898) #125588
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Adds a new cache and setting
TransportGetAllocationStatsAction.CACHE_TTL_SETTING "cluster.routing.allocation.stats.cache.ttl" to configure the max age for cached NodeAllocationStats on the master. The default value is currently 1 minute per the suggestion in issue 110716.
Closes #110716