Description

The reIndex commands says it accepts a writeConcern: https://docs.mongodb.com/manual/reference/command/reIndex/

The text around the writeConcern says "Optional. A document expressing the write concern of the drop command. Omit to use the default write concern."

It seems this is a typo and was copied from the drop command. The code appears to not allow a writeConcern with reIndex: https://github.com/mongodb/mongo/blob/39c08aceaf7fa15a8e65cf80b09863b452425426/src/mongo/db/commands/drop_indexes.cpp#L105

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