There were two leaves on the plant with these holes. I spotted the stinkbug 3-4 days ago when I saw the holes, got rid of the stinkbug and am watching the plant everyday. I have not noticed any other bug on the eggplants and I have not seen any more holes on those leaves or other leaves. So at the moment, I am going to assume that the stink bug was the culprit.
(Of course, its possible that the real culprit flew away and the stink bug was an innocent bystander, but not very likely, so I would say justice was served
)