Test populateEarliestModified against current prod index.

data/store/mongo/mongo_datum.go

@@ -827,8 +827,7 @@ func (d *DatumRepository) populateEarliestModified(ctx context.Context, userId s
 			"$gt": status.LastUpdated,
 		}
 		if lowerTimeBound, err := time.Parse(time.RFC3339, LowerTimeIndexRaw); err == nil && timeMin.After(lowerTimeBound) {
-			// has blocking sort, but more selective so usually performs better.
-			findOptions.SetHint("TestUserIdActiveTypeModifiedTimeTime")
+			findOptions.SetHint("UserIdActiveTypeTimeModifiedTime")
 		}
 	}