[Rest Api Compatibility] Dummy REST action for indices.upgrade api #75136
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indices upgrade api (/_upgrade or /{index}/_upgrade) was removed and _reindex is suggested to be used instead.
There is no easy way to translate _upgrade request to _reindex requests. The dummy Upgrade action will return an exception to a user with a message indicating that _reindex should be used.
upgrade api removal #64732
relates #51816