Merge pull request #765 from edx/e0d/bigdesk-plugin-bug

fixing bigdesk install logic.

playbooks/roles/elasticsearch/tasks/main.yml

@@ -80,7 +80,7 @@
 - name: install bigdesk plugin
   shell: >
     /usr/share/elasticsearch/bin/plugin -install lukas-vlcek/bigdesk/2.2.0
-  when: bigdesk.stat.isdir is defined and bigdesk.stat.isdir == false
+  when: bigdesk.stat.isdir is not defined
   
 - name: Ensure elasticsearch is enabled and started
   service: name=elasticsearch state=restarted enabled=yes
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