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Backwards Compatibility:
Fully Compatible
Sprint:
Repl 2022-02-21, Execution Team 2022-03-07, Execution Team 2022-03-21, Execution Team 2022-04-04, Execution Team 2022-04-18
Confidence Status:
None
Work Order:
3

We can do this by introducing a new internal data format version and use that when creating new unique indexes.

In the future, this new data format will guarantee that no legacy format secondary unique index entries are still around.

depends on

SERVER-64555 [5.0] Allow new unique index data formats to exist

SERVER-64617 [5.3] Allow new unique index data formats to exist

is depended on by

SERVER-63727 Optimize inserts for unique indexes that don't have old format keys

related to

SERVER-63582 Fail gracefully if a user tries converting a unique index with old format keys to a non-unique index.