title: Drupal 8 views ui : filter on custom field
body: <p>I m pretty new to D8 and I m trying to do the following thing : </p>
  
  <p>I have a content type : movie. 
  In that content type I have a custom field api_id wich is simply an integer. </p>
  
  <p>When I am on a movie page I want to display under the content a block with movies with the same api_id. </p>
  
  <p>I have managed to create block for the same movies from the same author but I can't figure out how to to filter on api_id (I have played so much with contextual filters ...) </p>
  
  <p>Any ideas ? Thx</p>