title: How to restart a node in redis cluster
body: <p>I have a redis cluster with 5 instances.</p>
  
  <p>Suddenly one instance started to  keep raising 'used_memory_rss' currently the 'mem_fragmentation_ratio' is higher than 650, so I want to restart only that instance without breaking any cluster setting.</p>
  
  <p>Currently, the cluster doesn't have any data, I flushed them all. Also it's kind of idle now, no connections for them. So downtime would be fine.</p>
  
  <p>How can I do this?</p>