1{
2 "topology_description": {
3 "type": "Unknown",
4 "servers": []
5 },
6 "operation": "write",
7 "read_preference": {
8 "mode": "SecondaryPreferred",
9 "tag_sets": [
10 {
11 "data_center": "nyc"
12 }
13 ]
14 },
15 "suitable_servers": [],
16 "in_latency_window": []
17}
18