minor #307 Update Configuration Documentation for Elasticsearch (filkaris)

This PR was merged into the 3.x-dev branch.

Discussion
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Update Configuration Documentation for Elasticsearch

Related to #296

Elasticsearch host must not have (http://) or (https://) in the configuration, just the IP or the domain name.

Otherwise an error is thrown that there is `No enabled connection`

Commits
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e5e728e Update Configuration Documentation for Elasticsearch

Author: lyrixx

DependencyInjection/Configuration.php

@@ -81,7 +81,7 @@
  * - elasticsearch:
  *   - elasticsearch:
  *      - id: optional if host is given
- *      - host: elastic search host name
+ *      - host: elastic search host name. Do not prepend with http(s)://
  *      - [port]: defaults to 9200
  *   - [index]: index name, defaults to monolog
  *   - [document_type]: document_type, defaults to logs