title: Group messages by a match?
body: <p>I have many messages like this:</p>
  
  <p><code>Error GetMilesFromLocationService(Eastvale, CA,Yorkshire, NY,1561517,19406,True.)</code></p>
  
  <p>The problem is that they are unique because of the city names.  In a Kibana Visualization, is it possible group these into "Error GetMilesFromLocationService" messages?  Here's an example of my metrics visual.  Ideally, they would all be in one row.</p>
  
  <p><img src="https://i.stack.imgur.com/JW1Hw.png" alt=""> </p>
  
  <p>These could be easily grouped by a regex match.</p>
  
  <p>Of course, I could add a new field with Logstash, but if Kibana is able to do this, I'll be happy.</p>
  
  <p>Thanks!</p>