Changed format of instances template. Name is required

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

@@ -4,8 +4,11 @@
 
 {% if node_generate_certs %}
 instances:
-{% for item in elasticsearch_cluster_nodes %}
-    ip: {{ item.ip }}
-    - "{{ item.name }}"
+
+{% for node in instances %}
+- name: "{{node.value.name}}"
+    ip:
+        - "{{ node.value.ip }}"
 {% endfor %}
+
 {% endif %}