title: Elasticsearch cluster with Shield - Node not joining to cluster
body: <p>I have 2 node ELK cluster configured with Shield plugin i.e. LDAP integrated.
  Cluster status says yellow. When I run cluster status/health command using curl , I do not see both nodes but only result of that node. i.e. The number of data nodes as 1</p>
  
  <p>elasticsearch.yml Node - 1 </p>
  
  <pre><code> cluster.name: TestELKCluster
   node.name: ${HOSTNAME}
   network.host: [_eth0_,_local_]
   index.number_of_shards: 2
   index.number_of_replicas: 1
   shield:
    authc:
      realms:
        ldap1:
          type: ldap
          order: 0
           url: "ldaps://abc.xyz.com:636"
          user_search:
            base_dn: "c=in, ou=abc, o=xyz.com"
            attribute: mail
          group_search:
            base_dn: "c=in, ou=abc, o=xyz.com"
          files:
            role_mapping: "/etc/elasticsearch/shield/role_mapping.yml"
          unmapped_groups_as_roles: false
          user_search.pool.health_check.enabled: false
   shield.audit.enabled: true
   node.master: true
   node.data: true
   discovery.zen.ping.multicast.enabled: false
   discovery.zen.ping.unicast.hosts: ["otherELKnodeIP"]
  </code></pre>
  
  <p>Node-2</p>
  
  <pre><code> cluster.name: TestELKCluster
   node.name: ${HOSTNAME}
   network.host: [_eth1_,_local_]
   shield:
    authc:
      realms:
        ldap1:
          type: ldap
          order: 0
          url: "ldaps://abc.xyz.com:636"
          user_search:
            base_dn: "c=in, ou=abc, o=xyz.com"
            attribute: mail
          group_search:
            base_dn: "c=in, ou=abc, o=xyz.com"
          files:
            role_mapping: "/etc/elasticsearch/shield/role_mapping.yml"
          unmapped_groups_as_roles: false
          user_search.pool.health_check.enabled: false
   shield.audit.enabled: true
   discovery.zen.ping.multicast.enabled: false
   discovery.zen.ping.unicast.hosts: ["otherELKnodeIP"]
  </code></pre>