We have a number of assertions for checking that we did not pump to version 8 yet.
I am in the process of muting them thus this issue to track them.
This is necessary so we can merge #38514 and get builds going.

• ResyncReplicationRequest, MetaDataCreateIndexService, RemoteClusterAware and RemoteClusterAware added by @jasontedor
• MetaStateService added by @andrershov