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New format unique indexes would be initially gated by a variable. Start using FCV to enable or disable new format unique indexes:

Plug-in new format indexes into upgrade/downgrade infratructure.
Setting FCV=4.2 will cause all exisinting unique indexes to be updated to new format. The content of indexes will not change. New entries will be in new format.
With FCV=4.0, existing new format index will remain in this format. Any new unique indexes will be created in old V2 format.
Enhance multiVersion test for collectionsPendingDrop.

depends on

SERVER-34745 Enhance SDI::cursor API seekExact's unittest for new format unique indexes

SERVER-34838 Fix multiVersion test failure seen with new unique indexes on binary downgrade

is depended on by

SERVER-34954 Verify unique index version upgrade for new --shardsvr nodes added to FCV 4.2 replica set shards

SERVER-35420 Remove stable optime candidates list from ReplicationCoordinator

SERVER-35344 Stable timestamp and _currentCommittedSnapshot are redundant

SERVER-32991 When V2Unique format indexes are present show a warning message when FCV=4.0 is set

SERVER-33535 Add microbenchmark tests for mixed entries (old and new) in new unique index

is duplicated by

SERVER-32990 Make sure that V2Unique indexes operate correctly after downgrade using MongoDB 4.2 binaries

related to

SERVER-36458 Investigate microbenchmark regression with timestamp safe unique indexes

(2 is depended on by, 1 is duplicated by, 1 related to)