Automatic Elasticsearch clusterization (hitachienergy#2426)

* Change defaults and change clustering condition

* Update documentation to mention limitation of Open Distro deployment

* Add fix for logging role

* Fix documentation after review

* Changes in template after review

* Add information to changelog

* Remove enter

* Changes in docs

CHANGELOG-1.2.md

@@ -11,6 +11,7 @@
 
 - [#2406](https://github.com/epiphany-platform/epiphany/issues/2406) - [Upgrade] [Filebeat] All settings for multiline feature are lost after upgrade
 - [#2380](https://github.com/epiphany-platform/epiphany/issues/2380) - Unable to drain nodes with Istio application enabled due to PodDisruptionBudgets
+- [#2332](https://github.com/epiphany-platform/epiphany/issues/2332) - [Elasticsearch] Error when having multiple VMs and non-clustered mode
 
 ### Updated
 

core/src/epicli/data/common/ansible/playbooks/roles/opendistro_for_elasticsearch/tasks/configure-es.yml

@@ -79,7 +79,7 @@
       {{ existing_es_config['opendistro_security.authcz.admin_dn'] if (is_upgrade_run) else
          [ _epiphany_DNs.admin ] }}
     _epiphany_nodes_dn: >-
-      {%- if specification.clustered -%}
+      {%- if groups[current_group_name] | length > 1 -%}
         {%- set nodes_to_iterate = ansible_play_hosts_all -%}
       {%- else -%}
         {%- set nodes_to_iterate = [ inventory_hostname ] -%}

core/src/epicli/data/common/ansible/playbooks/roles/opendistro_for_elasticsearch/templates/elasticsearch.yml.j2

@@ -75,7 +75,7 @@ transport.port: {{ transport_port }}
 # Pass an initial list of hosts to perform discovery when this node is started:
 # The default list of hosts is ["127.0.0.1", "[::1]"]
 #
-{% if specification.clustered %}
+{% if groups[current_group_name] | length > 1 -%}
 discovery.seed_hosts: [{% for host in groups[current_group_name] %}"{{hostvars[host]['ansible_default_ipv4']['address']}}"{%- if not loop.last -%},{% endif %}{% endfor %}]
 {% else %}
 discovery.seed_hosts: ["{{ ansible_default_ipv4.address | default(ansible_all_ipv4_addresses[0]) }}"]
@@ -86,7 +86,7 @@ discovery.seed_hosts: ["{{ ansible_default_ipv4.address | default(ansible_all_ip
 {% if is_upgrade_run | default(False) %}
 cluster.initial_master_nodes: []
 {% else %}
-  {% if specification.clustered %}
+  {% if groups[current_group_name] | length > 1 %}
 cluster.initial_master_nodes: [{% for host in groups[current_group_name] %}"{{hostvars[host]['ansible_hostname']}}"{%- if not loop.last -%},{% endif %}{% endfor %}]
   {% else %}
 cluster.initial_master_nodes: ["{{ ansible_hostname }}"]

core/src/epicli/data/common/defaults/configuration/logging.yml

@@ -3,7 +3,6 @@ title: Logging Config
 name: default
 specification:
   cluster_name: EpiphanyElastic
-  clustered: true
   admin_password: PASSWORD_TO_CHANGE
   kibanaserver_password: PASSWORD_TO_CHANGE
   kibanaserver_user_active: true

docs/home/howto/DATABASES.md

@@ -563,21 +563,16 @@ specification:
       count: 2
 ```
 
-**Default installation will be clustered** - it means, using a configuration like above, Elasticsearch cluster with 2
-instances will be created. In order to configure the non-clustered installation of more than one node modify
-configuration for Open Distro adding:
+**Installation with more than one node will be always clustered** - Option to configure the non-clustered installation of more than one node for Open Distro is not supported.
 
 ```yaml
 kind: configuration/opendistro-for-elasticsearch
 title: OpenDistro for Elasticsearch Config
 name: default
 specification:
   cluster_name: EpiphanyElastic
-  clustered: False
 ```
 
-Result of this configuration will be one or more independent nodes of OpenDistro.
-
 By default, Kibana is deployed only for `logging` component. If you want to deploy Kibana
 for `opendistro_for_elasticsearch` you have to modify feature mapping. Use below configuration in your manifest.