OAK-3555

[David Marginian]

I see OAK-3555 <https://issues.apache.org/jira/browse/OAK-3555>.  Has 
anyone tried to run with a 3.x Mongo driver, or should we be using a 2.x 
driver?  The issue seems to say 3.x is not supported yet but I wanted to 
make sure.  Thanks.