Allow CORS against elasticsearch API

Since we do fine grained access control to the API via a proxy that
limits what requests can be made from anywhere go ahead and allow CORS
requests from anywhere as they won't be able to write data anyways.

This is useful so that you can test a new version of $tool hosted
locally against the actual cluster or for admins to run admin tools
hosted locally against the cluster.

Change-Id: I774d0ad0b246315794ab387acc39c41c7cfac3cd
Depends-On: I0aa8d5167c770c1024b7596da582d6cc089b1b47

modules/openstack_project/manifests/elasticsearch_node.pp

@@ -32,6 +32,8 @@ class openstack_project::elasticsearch_node (
       'discovery.zen.minimum_master_nodes'   => '4',
       'discovery.zen.ping.multicast.enabled' => false,
       'discovery.zen.ping.unicast.hosts'     => $discover_nodes,
+      'http.cors.enabled'                    => true,
+      'http.cors.allow-origin'               => "'*'", # lint:ignore:double_quoted_strings
     },
     heap_size          => $heap_size,
     version            => '1.7.3',