In situations where a response from a mongod to a mongod or a mongos has a “code” field, we should pass the response through a helper function that munges it into ErrorExtraInfo and uses that ErrorExtraInfo as part of throwing a DBException. We can then use that type information to guide it through a different path in service infrastructure. In the immediate, it is most likely sufficient to encode the entire Egress Response BSONObj into the ErrorExtraInfo via functions analog to getStatusFromCommandResult().