title: What is The Z at the end of Date in Elasticsearch
body: <p>Why in Elasticsearch we have the 'Z'
  at the end of the date field?</p>
  
  <p>For instance:</p>
  
  <p>2016-05-16T00:00:00.000Z</p>
  
  <p>What does it mean?</p>
  
  <p>Is this something useful for anything?</p>
  
  <p>Is it harmful?</p>
  
  <p>Can I get rid of it?</p>
  
  <p>What about joda time?</p>