title: View all the documents loaded into vespa
body: <p>Is there any way to fetch all the documents loaded into vespa?</p>
  
  <p>I tried querying with regular expressions, but it didn't work as expected. </p>
  
  <p><code>select * from entity where ID matches "[.]+";</code></p>
  
  <p>ID is not an attribute, but I tried with an attribute field, both didn't respond with any values. </p>