[elastic] Update config format

ansible/roles/elasticsearch/files/elasticsearch.yml

@@ -1,9 +1,10 @@
-cluster.name: unblink
 node.name: es1-master
 path.data: /var/db/elasticsearch
 path.logs: /var/log/elasticsearch
 network.host: 0.0.0.0
 http.port: 9200
+
+cluster.name: unblink
 cluster.initial_master_nodes: ["es1-master"]
 
 # ml is not supported on FreeBSD