title: SharePoint 2013 Query for specific content type
body: <p>I am trying to get the Search Content Web Part to display an aggregation of announcements from various announcement lists in a site collection. </p>
  
  <p>I created the announcement lists using the "add an app" then "Announcements" so I am assuming that this is a list of the ContentType Announcement? I've added a new announcement to the list with a title of "this is a test".</p>
  
  <p>After I have added the Search Content Web Part to a page (for test purposes a page in the same site as the announcement list) and gone to set the Query on the web part to:</p>
  
  <pre><code>ContentType:0x0104*
  </code></pre>
  
  <p>No results are being returned. To check that the announcement has been indexed by the crawler changed the query to:</p>
  
  <pre><code>Title:this is a test
  </code></pre>
  
  <p>Now two results are displayed 1 a csv and the other the announcement with a ending with ../DispForm.aspx?ID=1 .</p>
  
  <p>Any help much appreciated.</p>