Find custom field value across all boards

gistfile1.txt

function searchCustomFieldOnAllBoards()
{
  var search_term = "apple";
  var field_name = "Product Name";
  var output = [];

  new Trellinator().boards().each(function(board)
  {
    board.cards().each(function(card)
    {
      if(card.customFieldValue().toLowerCase().indexOf(search_term.toLowerCase()) > -1)
      {
        output.push("Found in: "+card.link());
        Utilities.sleep(2000);
      }
    });
  });
  
  Logger.log(output.join("\n"));
}