title: Node not joining in cluster
body: <p>I'm creating a cluster with multiple(2) nodes but the nodes are not being detected.</p>
  
  <p>Node:-1</p>
  
  <pre><code>cluster.name: mycluster
  node.name: NODE1
  node.master: true
  node.data: true
  index.number_of_shards: 5
  index.number_of_replicas: 1
  discovery.zen.ping.multicast.enabled: false
  discovery.zen.ping.unicast.hosts: ["10.0.2.4"]
  </code></pre>
  
  <p>Node:-2</p>
  
  <pre><code>cluster.name: mycluster
  node.name: NODE2
  node.master: false
  node.data: true
  index.number_of_shards: 5
  index.number_of_replicas: 1
  discovery.zen.ping.multicast.enabled: false
  discovery.zen.ping.unicast.hosts: ["10.0.2.15"]
  </code></pre>
  
  <p>With this configuration first I start the master(node1) and the I start the slave(node2) but the slaves are not being detected</p>
  
  <p>I'm able to ping 10.0.2.15 from master and vice versa..</p>