[8.19] Add deprecation checks for indices with percolator fields (#138118) #138200
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Backport to [8.19] of #138118
This change modifies the deprecation API to check for any indices prior to 9.latest that have percolator fields in the mappings. Any that do are then returned as
required to be reindexed or deleted. Read-only is
excluded as this would not fix the underlying
transport version issue.
Note this change only concerns user created
indices. System indices will need to be addressed
separately as part of the migration API, but should be able to share code.
ES-13234