{ "description": "Unexpected mongos", "uri": "mongodb://b/?replicaSet=rs", "phases": [ { "responses": [ [ "b:27017", { "ok": 1, "helloOk": true, "isWritablePrimary": true, "msg": "isdbgrid", "minWireVersion": 0, "maxWireVersion": 6 } ] ], "outcome": { "servers": {}, "topologyType": "ReplicaSetNoPrimary", "logicalSessionTimeoutMinutes": null, "setName": "rs" } } ] }