title: iOS: Wait until user finishes typing and then send request
body: <p>I have a simple <strong>UITableView</strong> with <strong>UISearchBar/UISearchDisplayController</strong> that fetches results from remote <strong>ElasticSearch</strong> server by using RKObjectManager. 
  Problem I have is that if user types to quickly or the term is a bit bigger several of requests fail and sometimes I don't get the results.</p>
  
  <p>Is there an option to <strong>wait until user has stopped typing</strong> and then send request
  instead of sending request per each letter he types in?</p>