f0:string f1:int f2:int f3:double (all can be null)
no partition key
no bucket key
bucket count: -1
bitmap index: f0, f1, f2
set "file-index.in-manifest-threshold" : "1B" (force flush index file, not embedding)

Msgs:
snapshot-1
Add: Alice, 10, 1, 11.1
Add: Bob, 10, 1, 12.1
Add: Emily, 10, 0, 13.1
Add: Tony, 10, 0, 14.1
Add: Lucy, 20, 1, 15.1
Add: Bob, 10, 1, 16.1
Add: Tony, 20, 0, 17.1
Add: Alice, 20, null, 18.1
NoCompact
