use become: yes when root is needed

tasks/elasticsearch-plugins.yml

@@ -12,6 +12,7 @@
 
 #List currently installed plugins. We have to list the directories as the list commmand fails if the ES version is different than the plugin version.
 - name: Check installed elasticsearch plugins
+  become: yes
   shell: "ls {{es_home}}/plugins {{list_command}}"
   register: installed_plugins
   changed_when: False
@@ -30,6 +31,7 @@
 
 # This removes any currently installed plugins (to prevent errors when reinstalling)
 - name: Remove elasticsearch plugins
+  become: yes
   command: "{{es_home}}/bin/elasticsearch-plugin remove {{item}} --silent"
   ignore_errors: yes
   with_items: "{{ plugins_to_remove | default([]) }}"
@@ -41,6 +43,7 @@
     ES_INCLUDE: "{{ instance_default_file }}"
 
 - name: Install elasticsearch plugins
+  become: yes
   command: "{{es_home}}/bin/elasticsearch-plugin install {{ item.plugin }} --batch --silent {% if item.proxy_host is defined and item.proxy_host != '' and item.proxy_port is defined and item.proxy_port != ''%} -DproxyHost={{ item.proxy_host }} -DproxyPort={{ item.proxy_port }} {% elif es_proxy_host is defined and es_proxy_host != '' %} -DproxyHost={{ es_proxy_host }} -DproxyPort={{ es_proxy_port }} {% endif %}"
   register: plugin_installed
   failed_when: "'ERROR' in plugin_installed.stdout"
@@ -57,4 +60,5 @@
 
 #Set permissions on plugins directory
 - name: Set Plugin Directory Permissions
+  become: yes
   file: state=directory path={{ es_home }}/plugins owner={{ es_user }} group={{ es_group }} recurse=yes