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The current timeseries creation path is affected by several issues:

view and non-timeseries creation does not check for the presence of legacy system.buckets collection leading to the creation of both main namespace and legacy system.buckets collection (no concurrency required)
view and non-timeseries creation are not serialized properly with legacy timeseries creation leading to the creation of both main namespace and legacy system.buckets collection (concurrency required)
viewless and viewful timeseries creation are not serialized properly between each other leading to the creation of both viewless timeseries collection and legacy system.buckets collection (concurrency required)
a timeseries creation started in FCV 9.0 that encounter an orphaned system.buckets collection does not create the missing view.

In this ticket we will re-write the timeseries creation path to address all of the above.

is depended on by

SERVER-85855 Creating a bucket collection with timeseries option doesn't create the view

SERVER-90862 Creating a collection or a view should fail if a bucket namespace exists without its view

SERVER-119172 serialize multiple create timeseries collections with different OFCV

SERVER-119866 Repair orphaned timeseries buckets collection during createCollection regardless of viewless timeseries flag

is duplicated by

SERVER-119866 Repair orphaned timeseries buckets collection during createCollection regardless of viewless timeseries flag

is related to

SERVER-119160 Create collection can wrongly return NamespaceExists if run concurrently with drop

related to

SERVER-121293 Fail view/collection creation if orphan legacy timeseries buckets collection exists

SERVER-121290 Remove OLD_PRE_90 functions from create_collection.cpp

(1 is related to, 2 related to)