WIP installation and configuration.

defaults/main.yml

 ---
 # defaults file for ansible-elasticsearch
+
+elasticsearch_cors_domains: [ 'localhost', '*.{{ ansible_domain }}' ]

handlers/main.yml

 ---
 # handlers file for ansible-elasticsearch
+
+- name: Restart Elasticsearch
+  service:
+    name: elasticsearch
+    state: restarted

tasks/main.yml

 ---
 # tasks file for ansible-elasticsearch
+
+- name: Add apt repo key
+  apt_key:
+    url: https://packages.elastic.co/GPG-KEY-elasticsearch
+    state: present
+
+- name: Add apt repo
+  apt_repository:
+    repo: deb http://packages.elastic.co/elasticsearch/2.x/debian stable main
+    state: present
+    update_cache: yes
+
+- name: apt install
+  with_items:
+  - openjdk-7-jre-headless
+  - elasticsearch
+  apt:
+    name: '{{ item }}'
+    state: present
+    update_cache: yes
+    cache_valid_time: 3600
+
+- name: Set Java options
+  lineinfile:
+    dest: /etc/default/elasticsearch
+    line: "ES_JAVA_OPTS='-Djava.net.preferIPv4Stack=true'"
+    regexp: '^ES_JAVA_OPTS='
+    state: present
+  notify:
+  - Restart Elasticsearch
+
+- name: Copy configutation template
+  template:
+    src: elasticsearch.yml.j2
+    dest: /etc/elasticsearch/elasticsearch.yml
+    owner: root
+    group: root
+    mode: '0644'
+  notify:
+  - Restart Elasticsearch
+
+- name: Enable, start Elasticsearch service
+  service:
+    name: elasticsearch
+    state: started
+    enabled: yes

templates/elasticsearch.yml.j2

+{{ elasticsearch_config|to_nice_yaml }}

vars/main.yml

 ---
 # vars file for ansible-elasticsearch
+
+elasticsearch_config:
+  http.cors.enabled: true
+  'http.cors.allow-origin': '{{ elasticsearch_cors_domains }}'
+  indices.fielddata.cache.size: '50%'