Make xpack elasticsearch role idempotent (elastic#31)

ansible/roles/xpack_elasticsearch/tasks/linux/xpack_elasticsearch_set_passwords.yml

@@ -6,6 +6,21 @@
 ---
 
 
+- name: Check if password is set
+  block:
+    - name: Elasticsearch HTTPS GET ?pretty
+      uri:
+        url: "https://{{ current_host_ip }}:{{ elasticsearch_port }}/?pretty"
+        method: GET
+        user: "{{ elasticsearch_username }}"
+        password: "{{ elasticsearch_password }}"
+        validate_certs: no
+        return_content: yes
+        status_code: 200, 401
+      register: elastic_user_auth
+    - debug:
+        msg: '{{ elastic_user_auth }}'
+
 - name: Check if setup passwords executable exists
   stat:
     path: '{{ elasticsearch_setup_passwords_exe }}'
@@ -16,7 +31,8 @@
     echo 'y' | {{ elasticsearch_setup_passwords_exe }} auto
   register: initial_passwords
   when: file_setup_passwords.stat.exists is defined and file_setup_passwords.stat.exists and
-        file_setup_passwords.stat.executable is defined and file_setup_passwords.stat.executable
+        file_setup_passwords.stat.executable is defined and file_setup_passwords.stat.executable and
+        elastic_user_auth.status == 401
 
 - debug:
     msg: '{{ initial_passwords }}'