elasticsearch: add condition to whether or not install java.

ansible-role-elasticsearch/defaults/main.yml

@@ -7,3 +7,4 @@ elasticsearch_jvm_xms: null
 elastic_stack_version: 6.1.2
 elasticsearch_shards: 5
 elasticsearch_replicas: 1
+elasticsearch_install_java: yes

ansible-role-elasticsearch/tasks/Debian.yml

@@ -10,14 +10,16 @@
     repo: 'ppa:webupd8team/java'
     codename: 'xenial'
 
-- name: Debian/Ubuntu | Accept Oracle Java 8 license
+- when: elasticsearch_install_java
+  block:
+    - name: Debian/Ubuntu | Accept Oracle Java 8 license
       debconf:
         name: oracle-java8-installer
         question: shared/accepted-oracle-license-v1-1
         value: true
         vtype: boolean
 
-- name: Debian/Ubuntu | Oracle Java 8 installer
+    - name: Debian/Ubuntu | Oracle Java 8 installer
       apt: name=oracle-java8-installer state=present update_cache=yes
       tags: install
 

ansible-role-elasticsearch/tasks/RedHat.yml

@@ -1,12 +1,14 @@
 ---
-- name: RedHat/CentOS/Fedora | download Oracle Java RPM
+- when: elasticsearch_install_java
+  block:
+    - name: RedHat/CentOS/Fedora | download Oracle Java RPM
       get_url:
         url: http://download.oracle.com/otn-pub/java/jdk/8u161-b12/2f38c3b165be4555a1fa6e98c45e0808/jre-8u161-linux-x64.rpm
         dest: /tmp/jdk-8-linux-x64.rpm
         headers: 'Cookie:oraclelicense=accept-securebackup-cookie'
       register: oracle_java_task_rpm_download
 
-- name: RedHat/CentOS/Fedora | Install Oracle Java RPM
+    - name: RedHat/CentOS/Fedora | Install Oracle Java RPM
       package: name=/tmp/jdk-8-linux-x64.rpm state=present
       when: oracle_java_task_rpm_download is defined
       register: oracle_java_task_rpm_installed
@@ -22,5 +24,5 @@
 
 - name: RedHat/CentOS/Fedora | Install Elasticsarch
   package: name=elasticsearch-{{ elastic_stack_version }} state=present
-  when: oracle_java_task_rpm_installed is defined
+  when: not elasticsearch_install_java or oracle_java_task_rpm_installed is defined
   tags: install