"errmsg" : "While preparing to upgrade user doc from 2.6/3.0 user data schema to the 3.0 SCRAM only schema, found a user doc missing MONGODB-CR credentials :{ _id: \"$external.aks@WIN2012.AKS.EVILS.IN\", user: \"aks@WIN2012.AKS.EVILS.IN\", db: \"$external\", credentials: { external: true }, roles: [ { role: \"root\", db: \"admin\" } ] }",