[Bug] Create/Update Index Split is not supported on the Replayer through TypeMappingsSanitizationTransformerProvider

[AndreKurait]

What is the bug?

To handle type mappings deprecation, a customer may split a single source index into multiple target indexes.

Say a user has a source index twitter with multiple types tweet and user, the user configures the TypeMappingsSanitizationTransformerProvider to map tweet docs to twitter_tweet and user docs to twitter_user.

When a request is captured as an operation on the index twitter, e.g. update refresh interval, the replayer would be expected to apply this operation on both twitter_tweet and twitter_user target indexes.

This is not currently supported.

What are your migration environments?

Applies to source ES <= 6 (indexes created on ES <= 5)

What is the expected behavior?

The replayer supports 1:many request transformations and TypeMappingsSanitizationTransformerProvider natively handles index operations with split behavior.

[AndreKurait]

Will be addressed in https://opensearch.atlassian.net/browse/MIGRATIONS-2196