Steps to reproduce

1. Create 2 elasticsearch clusters, say "a" and "b"
2. Index some data in cluster "b" (cluster "a" should have no user created indices)
3. Setup "a" cluster to see "b" as a remote cluster
4. Launch kibana for cluster "a"
5. Go to index management

Observed behaviour

Notice that kibana does not let you type an index pattern saying there's no data. It is possible to work around this by clicking on include system indices. However, it feels wrong that users have to click on include system indices especially since it's recommended as good practice to have a CCS dedicated cluster (so it'll probably have no user indices).