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049970af3e
Today, when applying new cluster state we attempt to connect to all of its nodes as a blocking part of the application process. This is the right thing to do with new nodes, and is a no-op on any already-connected nodes, but is questionable on known nodes from which we are currently disconnected: there is a risk that we are partitioned from these nodes so that any attempt to connect to them will hang until it times out. This can dramatically slow down the application of new cluster states which hinders the recovery of the cluster during certain kinds of partition. If nodes are disconnected from the master then it is likely that they are to be removed as part of a subsequent cluster state update, so there's no need to try and reconnect to them like this. Moreover there is no need to attempt to reconnect to disconnected nodes as part of the cluster state application process, because we periodically try and reconnect to any disconnected nodes, and handle their disconnectedness reasonably gracefully in the meantime. This commit alters this behaviour to avoid reconnecting to known nodes during cluster state application. Resolves #29025.