Log job execution when executed through api

When executing a job through the api with following call
$result = civicrm_api3('Job', 'disable_expired_relationships', array(
'sequential' => 1,
));
there is no job log entry created. The api directly calls
CRM_Contact_BAO_Relationship::disableExpiredRelationships();

If the api could call the Job class, and executing the execute method there a log entry would be created.