Elasticsearch version 2.x can not start in docker container but 1.7.3 starts with same config

[abhijat]

@ajay_bh111

discovery.zen.ping.unicast.hosts: [ "${ES_ENV_M1}:9300","${ES_ENV_M2}:9300","${ES_ENV_M3}:9300" ]

What is the IP address used for ES_ENV_M1, ES_ENV_M3 and ES_ENV_M3? It should be the IP address of the VMs on which the ES containers are running...

Also, cali0, should be the NIC of the VM on which the container is running.