REF:

• https://jira.mongodb.org/browse/PYTHON-58
• https://jira.mongodb.org/browse/SERVER-2209

We'd like a sane method to timeout queries. This could be done driver-side; but ideally would be a query-specific option, supported by the server and thus would get picked up by all the drivers as a result for everyone to benefit. We have a few queries that on occasion run too long due to some concurrency related issues around .group(). We wrote a daemon to reap those processes, but it would be much more clean and generally useful to have a generic query timeout that actually kills the query server-side and results in a client-side error than just timing it out at the client and letting the server keep executing.