We have great coverage of the IDHack workload in genny with a simple find command. We have a test in mongo-perf called Queries.IdentityView.IntIdFindOne that simulates IDHack via a find command over an identity view. We have no perf test coverage of IDHack via any agg commands. We should add 3 workloads to Genny so that we can generate better side-by-side comparisons of different IDHack paths:

(1) IDHack via find over an identity view (a no-op view)

(2) IDHack via basic agg ({$match: {_id: x}})

(3) IDHack via agg over an identity view