Is there a good way to intentionally cause a slow mongo-aggregation operation?

问题

I'd like to test out some erorr handling code, so I'd like to find a consistent way of causing a slow aggregation operation, ideally without needing a lot of data.

For regular mongo queries, {$where: "sleep(10000) && true" } does this well, but mongo aggregations don't support javascript operators.

来源：https://stackoverflow.com/questions/56447145/is-there-a-good-way-to-intentionally-cause-a-slow-mongo-aggregation-operation