message: remove defaults from ES config, they're in dockerfile now.
diff: @@ -7,8 +7,8 @@ input {
  }
  http {
  id => "http_input"
  - user => "${LOGSTASH_USERNAME:username}"
  - password => "${LOGSTASH_PASSWORD:password}"
  + user => "${LOGSTASH_USERNAME}"
  + password => "${LOGSTASH_PASSWORD}"
  }
  }
  