title: How to map sorting fields of Pageable?
body: <p>I know I can map <code>page</code> and <code>size</code> fields for <code>Pageable</code> ex. </p>
  
  <p><code>http://example.com/foo?page=0&amp;size=10</code></p>
  
  <p>but how can I <strong>sort direction</strong> and <strong>sort field</strong>?</p>