[Minion] [returner] [Elasticsearch] Yaml read patch + example.pillar update (#359)

* Minion/returner/elasticsearch yaml read fix.

* Improved the documentation for the elasticsearch returner

salt/files/minion.d/f_defaults.conf

@@ -1215,16 +1215,18 @@ return:
 {% if 'elasticsearch' in cfg_minion -%}
 {%- do default_keys.append('elasticsearch') %}
 {%- do default_keys.append('return') %}
+
 #####   elasticsearch connection settings  #####
 ##########################################
+elasticsearch:
 {%- for name, value in cfg_minion['elasticsearch'].items() %}
 {%- if value is list %}
-elasticsearch.{{ name }}:
+  {{ name }}:
 {%- for objvalue in value %}
-  - {{ objvalue }}
+    - {{ objvalue }}
 {%- endfor %}
 {%- else %}
-elasticsearch.{{ name }}: {{ value }}
+  {{ name }}: {{ value }}
 {%- endif %}
 {%- endfor %}
 {%- endif %}