The functionality is not supported by any storage engine.

The RecordStore::getCursorForRepair() command will always return null pointer and result in a "repair iterator not supported" error when used.

The feature was introduced in 2015 and the functionality existed at one point dating back to 3.0 but not anymore, e.g. the following link redirects to the Database Commands page: https://docs.mongodb.com/manual/reference/command/repairCursor

We should figure out when it stopped being supported by anything, for the DOCS team's documentation change, if it was ever documented in the first place. The only documentation I found was at a weird site that looks similar to ours but isn't: http://www.dba86.com/docs/mongo/3.2/reference/command/repairCursor.html.