ElasticsearchMasterElement

Information about the Elasticsearch instances. For split-brain cases, this also includes sub-clusters.

instances (array[string], required): The names of the instance/container hosting the node belong to the cluster with the given master
master_instance_name (string): The corresponding instance name of the container hosting the Elasticsearch master node, if available
master_node_id (string, required): The Elasticsearch node id of a master node

{
   "instances" : [
      "string"
   ],
   "master_instance_name" : "string",
   "master_node_id" : "string"
}