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Establishing remote cluster connections uses a queue to coordinate multiple concurrent connect attempts. Connect attempts can be initiated by user triggered searches as well as by system events (e.g. when nodes disconnect). Multiple such concurrent events can lead to the connectListener of one event to be called under the thread context of another connect attempt. This can lead to the situation as seen in #31462 where the connect listener is executed under the system context, which breaks when fetching the search shards from the remote cluster. Closes #31462