Index is red and UNASSIGNED, reason: node_left

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1 
curl -XGET localhost:9200/_cat/shards?h=index,shard,prirep,state,unassigned.reason| grep UNASSIGNED

index-2017.01.20         3 p UNASSIGNED NODE_LEFT

When a node has been restarted, then some index will be unassigned. Any config I can do to prevent this will happen

2

What version are you on?

3

5.1.1

4

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