sorry take a better look, that's the BLIND hole side of the cover it's not threaded or though drilled, NO oil will ever come outYes the black oil plug is missing, should be one identical to the one on the other side of engine. Immediately check engine for correct oil level, do not start engine until you confirm correct oil level and install a new oil plug.
This is a major issue that could have resulted in a blown engine. I would immediately contact the dealer or store you purchased it from and let them know of this issue and that you are not happy about the poor quality control. They will need to supply a replacement plug.
I would go over the machine with a fine tooth comb, in case there are other issues or press the dealer or store to do a thorough set up and inspection.
Good catch and good luck