Mark index.merge.policy.max_merge_at_once_explicit not to be accepted in v10
#124807
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Introduce
Property.IndexSettingDeprecatedInV9AndRemovedInV10property setting to mark index settings that accepted on 9.x indices, but not on 10.0.Property.IndexSettingDeprecatedInV8AndRemovedInV9doesn't have any specific checks inAbstractScopedSettings#validateDeprecatedAndRemovedSetting, so didn't add any checks forIndexSettingDeprecatedInV9AndRemovedInV10. It's currently used just as a marker.See #80574, #90264, #120334
See ES-11224