[root@test43 ~]# curl -XGET 'http://localhost:9200/_cluster/health?pretty=true'
{
  "cluster_name" : "production",
  "status" : "red",
  "timed_out" : false,
  "number_of_nodes" : 7,
  "number_of_data_nodes" : 3,
  "active_primary_shards" : 19,
  "active_shards" : 38,
  "relocating_shards" : 0,
  "initializing_shards" : 0,
  "unassigned_shards" : 4,
  "delayed_unassigned_shards" : 0,
  "number_of_pending_tasks" : 0,
  "number_of_in_flight_fetch" : 0,
  "task_max_waiting_in_queue_millis" : 0,
  "active_shards_percent_as_number" : 90.47619047619048
}