Name of entity's UUID database table field, if it supports UUIDs.
Has the value FALSE if this entity does not use UUIDs.
Type: string
Overrides EntityStorageBase::$uuidKey
protected $uuidKey = 'uuid';
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Config!Entity!ConfigEntityStorage.php/property/ConfigEntityStorage::uuidKey/8.1.x