Ability to disable x-pack features

Author: Dale McDiarmid

README.md

@@ -210,7 +210,11 @@ ansible-playbook -i hosts ./your-playbook.yml
 
 ### Installing X-Pack Features
 
-X-Pack features, such as Security, are supported. This feature is currently experimental.  To enable X-Pack set the parameter `es_enable_xpack` to true and list the required features in the parameter `es_xpack_features`.  The following additional parameters allow X-Pack to be configured:
+X-Pack features, such as Security, are supported. This feature is currently experimental.  To enable X-Pack set the parameter `es_enable_xpack` to true and list the required features in the parameter `es_xpack_features`.  
+
+The parameter `es_xpack_features` by default enables all features i.e. it defaults to ["alerting","monitoring","graph","security","reporting"]
+
+The following additional parameters allow X-Pack to be configured:
 
 * ```es_message_auth_file``` System Key field to allow message authentication. This file should be placed in the 'files' directory.
 * ```es_role_mapping``` Role mappings file declared as yml as described [here](https://www.elastic.co/guide/en/x-pack/current/mapping-roles.html)

defaults/main.yml

@@ -24,7 +24,7 @@ es_work_dir: "/tmp/elasticsearch"
 es_max_open_files: 65536
 es_allow_downgrades: false
 es_enable_xpack: false
-es_xpack_features: []
+es_xpack_features: ["alerting","monitoring","graph","security","reporting"]
 #These are used for internal operations performed by ansible.
 #They do not effect the current configuration
 es_api_host: "localhost"

templates/elasticsearch.yml.j2

@@ -23,3 +23,19 @@ path.work: {{ work_dir }}
 {% endif %}
 
 path.logs: {{ log_dir }}
+
+{% if not "security" in es_xpack_features %}
+xpack.security.enabled: false
+{% endif %}
+
+{% if not "monitoring" in es_xpack_features %}
+xpack.monitoring.enabled: false
+{% endif %}
+
+{% if not "alerting" in es_xpack_features %}
+xpack.watcher.enabled: false
+{% endif %}
+
+{% if not "reporting" in es_xpack_features %}
+xpack.reporting.enabled: false
+{% endif %}