$ oc exec <any_es_pod_in_the_cluster> -c elasticsearch – es_util -query="_cluster/settings" -XPUT -d '{ "persistent":

{ "cluster.routing.allocation.enable" : "primaries" }

}'

becomes 

$ oc exec <any_es_pod_in_the_cluster> -c elasticsearch – es_util --query="_cluster/settings" -XPUT -d '{ "persistent":

{ "cluster.routing.allocation.enable" : "primaries" }

}'