Please see https://github.com/meteor/meteor/issues/6957 for a high level description of what needs to be done on this ticket. --- Time estimate: 1 to 4 days. Looks like we need to upgrade the driver, and parts of our `mongo` code. And upgrade to Node 4. See https://github.com/meteor/meteor/issues/5763
