Old versions of the Java driver send the invalid option "usePowerOf2Sizes" to the "create" command, when users request to create a collection with the "power of 2" storage allocation strategy. The correct name of the option to use is "flags", per the create command reference.

Original description:

Drivers can still pass the usePowerOf2Sizes option to the create command, so the server should not reject the option, even though it is no longer meaningful.