test that the lastest package has been installed.

playbooks/roles/elasticsearch/tasks/main.yml

 - name:  elasticsearch | check for elasticsearch
   command: test -f /var/tmp/elasticsearch-${elasticsearch_version}.deb
   ignore_errors: true
-  register: es_present
+  register: elasticsearch_present
 
 - name:  elasticsearch | download elasticsearch
   get_url: url={{ elasticsearch_url }} dest=/var/tmp/{{ elasticsearch_file }}
-  when: es_present|failed
+  when: elasticsearch_present|failed
   tags:
     - elasticsearch
     - install
 
 - name:  elasticsearch | check elasticsearch version
-  command: 'curl -s -XGET localhost:9200'
-  register: elasticsearch_running_version
-
-- name: elasticsearch | debug
-  debug: msg="Debuging {{ elasticsearch_running_version }}"
-
-- name: elasticsearch | parse
-  datagrabber: data='{"ok":true}'
-  register: foo_bar
-
-- name: elasticsearch | debug2
-  debug: msg="$foo_bar.ok"
+  shell: test -n "$(dpkg --list elasticsearch | grep {{ elasticsearch_version }})"
+  ignore_errors: true
+  register: elasticsearch_installed
 
 - name: elasticsearch | install elasticsearch from local package
   shell: executable=/bin/bash dpkg -i /var/tmp/elasticsearch-${elasticsearch_version}.deb
-  only_if: "{{ elasticsearch_running_version }} != {{ elasticsearch_version }}" 
+  when: elasticsearch_installed|failed
   tags:
     - elasticsearch
     - install