{
"error": true,
"read_preference": {
"maxStalenessSeconds": 0,
"mode": "Nearest"
},
"topology_description": {
"servers": [
{
"address": "a:27017",
"avg_rtt_ms": 5,
"lastUpdateTime": 0,
"lastWrite": {
"lastWriteDate": {
"$numberLong": "2"
}
},
"maxWireVersion": 5,
"type": "RSPrimary"
},
{
"address": "b:27017",
"avg_rtt_ms": 5,
"lastUpdateTime": 0,
"lastWrite": {
"lastWriteDate": {
"$numberLong": "1"
}
},
"maxWireVersion": 4,
"type": "RSSecondary"
}
],
"type": "ReplicaSetWithPrimary"
}
}