{
    "error": true, 
    "read_preference": {
        "maxStalenessSeconds": 120,
        "mode": "Nearest"
    }, 
    "topology_description": {
        "servers": [
            {
                "address": "a:27017", 
                "avg_rtt_ms": 5, 
                "lastUpdateTime": 0, 
                "maxWireVersion": 5, 
                "type": "RSSecondary"
            }
        ], 
        "type": "ReplicaSetNoPrimary"
    }
}
