As part of SERVER-75424, we moved bucket_spec.cpp|h and bucket_unpacker.cpp|h into mongo/db/exec/timeseries directory. It would be better to move all timeseries-related classes/functions into mongo::timeseries namespace.

Related classes: BucketSpec and BucketUnpacker

Update: as of today (9/19/2023), bucket_spec.cpp|h has been moved to mongo/db/query/timeseries directory.

FYI:
Evergreen patch command

% ~/evergreen patch --project mongodb-mongo-master -a required

Ninja generation command

% ./buildscripts/scons.py --variables-files=etc/scons/mongodbtoolchain_stable_clang.vars --link-model=dynamic --ninja ICECC=icecc CCACHE=ccache

Please, make sure that it has --link-model=dynamic.