Watchers cause master node load spike

Notice the monitoring graph. There is a spike in load every 10 minutes which coincides with the interval time of our watchers (3 of them). Why are these causing such high load on the master? Since the data node in our 2 node setup will handle the grunt of the "work" for searches and the master is doing relatively little work, why would this happen for watchers? Should I expect the same behavior if I force the data node to execute watchers instead of the master?

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