Add "extra config" to kibana.yml (#270)

fixes #208

docs/role-kibana.md

@@ -13,6 +13,7 @@ Role Variables
 * *kibana_tls*: Whether to offer `https` for clients or not (default: `false`)
 * *kibana_tls_cert*: Path to the certificate Kibana should show to its clients (default: `/etc/kibana/certs/cert.pem`)
 * *kibana_tls_key*: Path to the key Kibana should use when communicating with clients (default: `/etc/kibana/certs/key.pem`)
+* *kibana_extra_config*: You can add arbitraty configuration options with this option. Just start it with `|-` and indent the following lines. So you can add as many lines and options to `kibana.yml` as you like. (default: none)
 
 * *kibana_security*: Activate TLS and authentication when connecting to Elasticsearch. **Note**: Only works when `elasticstack_full_stack` is enabled. (default: `true`)
 

molecule/elasticstack_default/converge.yml

@@ -23,6 +23,8 @@
       - system
     beats_fields:
       - "testbed: molecule"
+    kibana_extra_config: |-
+      ops.interval: 5000
   tasks:
     - name: Enable Elastic installation on RHEL 9
       ansible.builtin.set_fact:

roles/kibana/templates/kibana.yml.j2

@@ -30,3 +30,7 @@ server.ssl.enabled: true
 server.ssl.certificate: "{{ kibana_tls_cert }}"
 server.ssl.key: "{{ kibana_tls_key }}"
 {% endif %}
+
+{% if kibana_extra_config is defined %}
+{{ kibana_extra_config }}
+{% endif %}