In the server 2.8.0-rc0 release, the listCollections and listIndexes commands did not support cursors.
In the 2.8.0-rc3 release, they supported both cursor-based and non-cursor-based results, based on whether a cursor document was passed as part of the request.
In the 2.8.0-rc4 release the transition was completed and only cursor-based results are supported.

This ticket is for removing the driver's support for 2.7/2.8 releases prior to 2.8.0-rc4, in order to simplify the driver code.