Hi Dadoonet,
I am doing it on my local machine and to test this scenario .. i need to test it on my local machine.
So i m running 3 ES instances on my machine and all are running fine but one instance which is started as a service which config file located in "/etc/elasticsearch" is not joining cluster.
I went through ES doc to add nodes(running on different machines) into cluster- https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-network.html#common-network-settings
It is saying no need to change network config settings if all nodes are running on same machine.