Oaipmh Retract very slow

Steps to reproduce:
1. Retract Event from Oaipmh-publication
2.
3.

Actual Results:
For every Element of the Mediapackage one Job is created.
This is very slow. And takes a lot of load on engage.

Expected Results:
One Job is created for retraction of one event. -> Bulk retraction

Workaround (if any):