The key to use for the form element containing the entities.
Type: string
protected $entitiesKey = 'entities';
© 2001–2016 by the original authors
Licensed under the GNU General Public License, version 2 and later.
Drupal is a registered trademark of Dries Buytaert.
https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Config!Entity!DraggableListBuilder.php/property/DraggableListBuilder::entitiesKey/8.1.x