I have a new question about the behavior of elasticsearch when it comes to cross cluster replication.
First up, I cannot reproduce the issue, and I don't see any logs regarding an API call for closing an index in the elastic logs.
So, for whatever reason, all our follower indices got closed after we restarted elasticsearch (it seems that it is connected to the restart) - happened on both datacenters (bi-directional setup):
My question is, is there a situation, where elasticsearch actively closes indices? As I said, I did not find any loglines which state that they got closed by an API call or whatsoever.