The original ID of the configuration entity.
The ID of a configuration entity is a unique string (machine name). When a configuration entity is updated and its machine name is renamed, the original ID needs to be known.
Type: string
protected $originalId;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Config!Entity!ConfigEntityBase.php/property/ConfigEntityBase::originalId/8.1.x