title: Total count in Google appengine fulltext search
body: <p>I'm trying to count total rows of a fulltext search document. In  <a href="https://developers.google.com/appengine/docs/java/search/overview#Queries_on_Fields" rel="noreferrer">Google documentation</a> appear the expression count(size) however I do not get it to work.</p>
  
  <p>I'm working in Java.</p>
  
  <p>Is there any example about how to use 'count' expression?</p>