Add elasticsearch port

and ps to make the port configurable

Change-Id: I919767469087b9579e3d2f0965df835e7b71c327

ansible/roles/elasticsearch/templates/elasticsearch.yml.j2

@@ -10,6 +10,7 @@ node.data: true
 discovery.zen.ping.unicast.hosts: [{% for host in groups['elasticsearch'] %}"{{ hostvars[host]['ansible_' + hostvars[host]['api_interface']]['ipv4']['address'] }}"{% if not loop.last %},{% endif %}{% endfor %}]
 
 discovery.zen.minimum_master_nodes: {{ minimum_master_nodes }}
+http.port: {{ elasticsearch_port }}
 gateway.expected_nodes: {{ num_nodes }}
 gateway.recover_after_time: "5m"
 gateway.recover_after_nodes: {{ recover_after_nodes }}