https://github.com/logstash-plugins/logstash-patterns-core/blob/master/patterns/grok-patterns#L65
http://grokdebug.herokuapp.com/
https://www.elastic.co/guide/en/logstash/5.4/deploying-and-scaling.html
https://github.com/logstash-plugins/logstash-patterns-core/blob/master/patterns/grok-patterns#L65
http://grokdebug.herokuapp.com/
https://www.elastic.co/guide/en/logstash/5.4/deploying-and-scaling.html