New task to create elasticsearch users

Fixes #269
Fixes #268

roles/elastic-stack/ansible-elasticsearch/README.md

@@ -79,6 +79,13 @@ Example Playbook
       node_certs_generator_ip: 172.16.0.111
 
   vars:
+    elasticsearch_xpack_users:
+      anne:
+        password: 'PasswordHere'
+        roles: '["kibana_user", "monitoring_user"]'
+      jack:
+        password: 'PasswordHere'
+        roles: '["superuser"]'
     instances:
       node-1:
         name: node-1

roles/elastic-stack/ansible-elasticsearch/tasks/xpack_security.yml

@@ -194,3 +194,19 @@
   when:
     - node_certs_generator
   tags: molecule-idempotence-notest
+
+- name: Create elasticsearch users
+  uri:
+    url: "https://{{ elasticsearch_reachable_host }}:9200/_security/user/{{ item.key }}"
+    method: POST
+    body_format: json
+    user: "{{ elasticsearch_xpack_security_user }}"
+    password: "{{ elasticsearch_xpack_security_password }}"
+    body: '{ "password" : "{{ item.value["password"] }}", "roles" : {{ item.value["roles"] }} }'
+    validate_certs: no
+  loop: "{{ elasticsearch_xpack_users|default({})|dict2items }}"
+  register: http_response
+  failed_when: http_response.status != 200
+  when:
+    - elasticsearch_xpack_users is defined
+    - node_certs_generator