Fixes issue 70, Improves plugin management, Refactoring, Updates tests, Introduces multiple data dir support

tasks/elasticsearch-plugins.yml

@@ -1,22 +1,32 @@
 ---
 
-#es_plugins_reinstall will be set to true if elasticsearch_install.changed i.e. we have changed ES version
+#es_plugins_reinstall will be set to true if elasticsearch_install.changed i.e. we have changed ES version, or if no plugins listed. Otherwise it is false and requires explicitly setting.
 - set_fact: es_plugins_reinstall=true
-  when: elasticsearch_install.changed
+  when: elasticsearch_install.changed or es_plugins is not defined or es_plugins is none
+
+- set_fact: list_command="list"
+
+- set_fact: list_command="--list"
+  when: es_version | version_compare('2.0', '<')
 
 #List currently installed plugins
+- shell: "{{es_home}}/bin/plugin {{list_command}} | sed -n '1!p' | cut -d '-' -f2-"
+  register: installed_plugins
+  changed_when: False
+  environment:
+      CONF_DIR: "{{ conf_dir }}"
+      ES_INCLUDE: "{{ instance_default_file }}"
 
-
-
-#This needs to removed installed plugins not those listed
+#This needs to removes any currently installed plugins
 - name: Remove elasticsearch plugins
-  command: "{{es_home}}/bin/plugin remove {{ item.plugin }} --silent"
+  command: "{{es_home}}/bin/plugin remove {{item}} --silent"
   ignore_errors: yes
-  with_items: es_plugins
-  when: es_plugins_reinstall
+  with_items: installed_plugins.stdout_lines
+  when: es_plugins_reinstall and installed_plugins.stdout_lines | length > 0 and not 'No plugin detected' in installed_plugins.stdout_lines[0]
   notify: restart elasticsearch
   environment:
     CONF_DIR: "{{ conf_dir }}"
+    ES_INCLUDE: "{{ instance_default_file }}"
 
 - name: Install elasticsearch plugins
   #debug: var=item
@@ -25,7 +35,7 @@
   failed_when: "'Failed to install' in plugin_installed.stderr"
   changed_when: plugin_installed.rc == 0
   with_items: es_plugins
-  when: ansible_os_family == 'RedHat' or ansible_os_family == 'Debian'
+  when: es_plugins is defined and not es_plugins is none
   notify: restart elasticsearch
   environment:
     CONF_DIR: "{{ conf_dir }}"