first disable shard allocation:
PUT /_cluster/settings
{ "transient" : { "cluster.routing.allocation.enable" : "none" } }
restart the node service elasticsearch restart
Enable shard allocation:
PUT /_cluster/settings
{ "transient" : { "cluster.routing.allocation.enable" : "all" } }
https://www.elastic.co/guide/en/elasticsearch/guide/current/_rolling_restarts.html