Modified template to accept newly defined variables

roles/elastic-stack/ansible-elasticsearch/templates/instances.yml.j2

@@ -4,10 +4,10 @@
 
 {% if node_certs_generator %}
 instances:
-{% for node in instances %}
+{% for (key,value) in instances.iteritems() %}
-- name: "{{ node.name }}"
+- name: "{{ value.name }}" 
   ip:
-   - "{{ node.ip }}"
+   - "{{ value.ip }}"
 {% endfor %}
 
-{% endif %}
+{% endif %}