[8.x] Remove index.merge.policy.max_merge_at_once_explicit
deprecation
#124792
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This setting is not getting removed in ES 9.0, so its usage should not generate a critical deprecation warning. This is an index setting and should have been marked as
IndexSettingDeprecatedInV8AndRemovedInV9
, but we can't change that in 8.x and will mark it asIndexSettingDeprecatedInV9AndRemovedInV10
in 9.0See #80574, #90264
See ES-11224