Am I correct in thinking that it's not currently possible to search for an occurrence by identifier or the occurrenceID fields?

For example, if I want to search the recently added Geographically tagged INSDC sequences dataset 

http://www.gbif.org/dataset/ad43e954-dd79-4986-ae34-9ccdbd8bf568 using the accession number I would need to search on either of these fields. 

Regards 

Rod