Accept a single data item.
@todo Using job item breaks the current convention which uses jobs.
$job_item: The Job item the accepted data item belongs to.
$key: The key of the accepted data item. The key is an array containing the keys of a nested array hierarchy path.
TRUE if the approving was succesfull, FALSE otherwise. In case of an error, it is the responsibility of the translator to provide informations about the failure by adding a message to the job item.
public function acceptedDataItem(JobItemInterface $job_item, array $key);