title: Random order & pagination Elasticsearch
body: <p>In <a href="https://github.com/elasticsearch/elasticsearch/issues/1170#issuecomment-4587811">this issue</a> 
  is a feature request for ordering with optional seed allowing for recreation of random order.</p>
  
  <p>I need to be able to paginate random ordered results. 
  How could this be be done with Elasticsearch 0.19.1 ?</p>
  
  <p>Thanks.</p>