At the time of writing, DocumentSourceUnwind is used outside of the query module by the following external consumers:

• atlas_streams (streams/exec/planner.cpp)

• catalog_and_routing (src/mongo/db/global_catalog/ddl/sharding_catalog_manager_placement_history_operations.cpp)
• data_movement (src/mongo/db/s/balancer/auto_merger_policy.cpp)

As such, this ticket tracks the work to remove these dependencies so that DSUnwind can be private to the query module.