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770ad53978
Rather than scheduling pings to the leader index when we are caught up to the leader, this commit introduces long polling for changes. We will fire off a request to the leader which if we are already caught up will enter a poll on the leader side to listen for global checkpoint changes. These polls will timeout after a default of one minute, but can also be specified when creating the following task. We use these time outs as a way to keep statistics up to date, to not exaggerate time since last fetches, and to avoid pipes being broken.