title: Filter by id as well as text in Select2
body: <pre><code>var data = [{ id: 11-07, text: 'enhancement' }, { id: 11-04, text: 'bug' }, 
              { id: 11-08, text: 'duplicate' }, { id: 11-09, text: 'invalid' }, 
              { id: 11-10, text: 'wontfix' }];
  
  $(".js-example-data-array").select2({
  data: data
  })
  &lt;select class="js-example-data-array"&gt;&lt;/select&gt;
  </code></pre>
  
  <p>I want to filter the select2 with both id as well as text. By default , it filters by text.
  How can I filter by id as well?</p>