Update index retention policy to ensure its an int

The current variable, when there's only one host will result in 'false'
instead of 0, which is a jinja-ism however due to java-ism's "false" is
evaluated to 5 and that makes the index retention policy very wrong.

Change-Id: I2668e17c1cf15fe47842ff349ffa4f71c70257e5
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

elk_metrics_6x/common_task_data_node_hosts.yml

@@ -112,7 +112,7 @@
 # ingest nodes.
 - name: Set data nodes
   set_fact:
-    elasticsearch_number_of_replicas: "{{ ((data_nodes | length) > 1) | ternary(((data_nodes | length) > 2 | ternary(2, 1)), 0) }}"
+    elasticsearch_number_of_replicas: "{{ ((data_nodes | length) > 2) | ternary('2', ((data_nodes | length) > 1) | ternary('1', '0')) }}"
     elasticsearch_data_hosts: |-
       {% set nodes = elasticsearch_data_node_details %}
       {% if inventory_hostname in data_nodes %}

elk_metrics_6x/createElasticIndexes.yml

@@ -44,4 +44,4 @@
             indices.queries.cache.size: "5%"
         - name: "_all/_settings"
           index_options:
-            index.number_of_replicas: "{{ elasticsearch_number_of_replicas }}"
+            index.number_of_replicas: "{{ elasticsearch_number_of_replicas | int }}"

elk_metrics_6x/templates/_include_setup_template.yml.j2

@@ -3,7 +3,7 @@
 # These settings can be adjusted to load your own template or overwrite existing ones.
 
 # Set to false to disable template loading.
-setup.template.enabled: false
+setup.template.enabled: {{ inventory_hostname == data_nodes[0] }}
 
 # Template name. By default the template name is "{{ beat_name }}-%{[beat.version]}"
 # The template name and pattern has to be set in case the elasticsearch index pattern is modified.
@@ -18,7 +18,7 @@ setup.template.pattern: "{{ beat_name }}-%{[beat.version]}-*"
 setup.template.fields: "${path.config}/fields.yml"
 
 # Overwrite existing template
-setup.template.overwrite: false
+setup.template.overwrite: {{ inventory_hostname == data_nodes[0] }}
 
 {% set shards = ((data_nodes | length) * 3) | int %}
 
@@ -35,7 +35,7 @@ setup.template.settings:
     number_of_routing_shards: {{ (shards | int) * 2 }}
     # The default number of replicas will be based on the number of data nodes
     # within the environment with a limit of 2 replicas.
-    number_of_replicas: {{ elasticsearch_number_of_replicas }}
+    number_of_replicas: {{ elasticsearch_number_of_replicas | int }}
 
   # A dictionary of settings for the _source field. For more details, please check
   # https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-source-field.html

elk_metrics_6x/templates/curator-actions.yml.j2

@@ -68,7 +68,7 @@
          "exclude_nodes": (groups['kibana'] | map('extract', hostvars, 'ansible_host') | list)
        },
        "number_of_shards": 1,
-       "number_of_replicas": elasticsearch_number_of_replicas,
+       "number_of_replicas": (elasticsearch_number_of_replicas | int),
        "shrink_suffix": '-shrink',
        "copy_aliases": true,
        "delete_after": true,