Setting up elastic search master and data node configuration in two different servers

[virat (Virat Mishra)]

I have two elasticsearch running on two different servers, I have same indexes on both servers. I want to have a master and data node configuration, for that below are the configuration changes which I did so far:

Master Node -> xx.xx.xx.xx:9200

cluster-name : ABC
Node-name : XYZ
node.master: true
node.data: false
node.ingest: false
http.port: 9200
discovery.zen.ping.unicast.hosts: ["127.0.0.1","zz.zz.zz.zz:9200"]

Data Node: -> zz.zz.zz.zz:9200

cluster-name : ABC
node.name: PQR
node.master: false
node.data: true
node.ingest: false
http.port: 9200
discovery.zen.ping.unicast.hosts: ["127.0.0.1","xx.xx.xx.xx:9200"]

The problems are -

1. When I search some indexes from master I get the result but when I hit second server(having only data node), I get master_not_discovered_exception. reason ?
2. How to check if master and data node configuration is working properly?

I am a newbie here

[virat (Virat Mishra)]

I have got the solution. As I installed through rpm packages in the logs I was getting below issue:

[2017-08-24T03:50:01,331][INFO ][o.e.d.z.ZenDiscovery ] [node-2] failed to send join request to master [{node-1}{sYqhGZc4QyK_cbZ9_cz8gQ}{BBHUedE6Roaw0AMiYnQwIg}{172.31.4.119}{172.31.4.119:9300}], reason [RemoteTransportException[[node-1][172.31.4.119:9300][internal:discovery/zen/join]]; nested: IllegalArgumentException[can't add node {node-2}{sYqhGZc4QyK_cbZ9_cz8gQ}{FbDpyWy2S7SS1c8TvLsnfQ}{172.31.4.118}{172.31.4.118:9300}, found existing node {node-1}{sYqhGZc4QyK_cbZ9_cz8gQ}{BBHUedE6Roaw0AMiYnQwIg}{172.31.4.119}{172.31.4.119:9300} with the same id but is a different node instance]; ]

I had deleted contents of data folder(/var/lib/elasticsearch/nodes/0) and restarted both the servers and it worked for me.