title: how to use mongodb patterns in logstash
body: <p>In logstash there are several <a href="https://github.com/logstash-plugins/logstash-patterns-core/blob/master/patterns/mongodb" rel="nofollow">predefined patterns</a> for a mongodb log. </p>
  
  <p>However as there are multiple types of patterns (mongo_log, mongo_query etc) I am not sure how these should be used in a filter for parsing the mongodb.log file</p>