BTW, by default MongoDB drivers do not wait for the operation to be executed on the server
to return. So you could insert a data that would fail but not be noticed by the client.
To avoid that, you need to pass the safe=true option.
I think we should offer an option to be safe. Should it be the default?
hibernate.ogm.mongodb.safe
Any take on this one? It should be easy enough. Eventually we will want a more fine
grained setting but until then let's put that in place.