Store DataTier Preference directly on IndexMetadata (#78668) #78874
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The data tier preference is very expensive to parse out of the setting string
repeatedly for large number of indices when using it in the data tier allocation decider.
=> as done with other index settings relevant to allocation, this commit moves the data tier
preference to a field in
IndexMetadata
. The required moving theDataTier
class itself toserver
. In a follow-up we can look into making the setting a list setting to remove theduplication around turning the string value into a list in various places.
backport of #78668