Additional cleanup.

playbooks/roles/elasticsearch/tasks/main.yml

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

playbooks/roles/elasticsearch/vars/main.yml

 ---
 
-elastic_search_version: "0.90.2"
-elastic_search_sha: "397227ce37f616734f39f6e93539c9eaa82bec9"
-elastic_search_file: "elasticsearch-${elastic_search_version}.deb"
-elastic_search_url: "https://download.elasticsearch.org/elasticsearch/elasticsearch/{{ elastic_search_file }}"
\ No newline at end of file
+elasticsearch_version: "0.90.2"
+elasticsearch_sha: "397227ce37f616734f39f6e93539c9eaa82bec9"
+elasticsearch_file: "elasticsearch-${elastic_search_version}.deb"
+elasticsearch_url: "https://download.elasticsearch.org/elasticsearch/elasticsearch/{{ elastic_search_file }}"
\ No newline at end of file