SERVER-81927 involves moving tests that do not depend on bucketing behavior from jstests/noPassthrough/timeseries into jstests/core/timeseries. However, it looks like a good number of these candidates (for example, jstests/noPassthrough/timeseries/timeseries_expire.js ) rely on setting the parameter for `ttlMonitorSleepSecs` to a lower value to test TTL behavior. Setting this parameter on the DB in sharded passthroughs will involve setting this parameter on a mongos, which will fail. 

It doesn't look like there is much TTL testing behavior in core - this ticket would involve creating a more structured way to set TTL behavior in core tests, which would make moving a number of timeseries tests into core easier and presumably increase coverage for TLL behavior.