Mongoose: Change 2dsphere index version
I ended up changing the .metadata.json file to look like this:

{"options":{},"indexes":[{"v":1,"key":{"_id":1},"name":"_id_","ns":"Loc8r.locations"},{"v":1,"key":{"coords":"2dsphere"},"name":"coords_2dsphere","ns":"Loc8r.locations","background":true,"2dsphereIndexVersion":2}]}