[Remote Store Migration] Remote store settings are not reflected in IndexShard after index migration

[shourya035]

Describe the bug

After a remote-store migration, the IndexMetadataUpdater applies all remote store based index settings after all assigned shard copies of an index gets moved over to remote store enabled nodes. However, those remote store based settings does not have any consumers defined in IndexSettings. Because of this, even though the index metadata is updated in the cluster state, the corresponding instances of IndexSettings being held by each IndexShard copy does not get updated with the latest values.

Related component

Storage:Remote

To Reproduce

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Expected behavior

We need to add consumers to the following index settings to ensure that changes in those values are reflected automatically after the index metadata is changed in the cluster state. The settings are already marked as PrivateIndex, so adding the consumer would still keep the Opensearch managed nature of the setting.

Additional Details

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