RecomputeFuzzyIndexStatistics method not working with GroupShare 2017 TMs

I developed an application that imports and re-indexes Server TMs.

Calling the method

 

selectedTm.RecomputeFuzzyIndexStatistics();

 

throws a "Method not supported" error.

 

When running my code from a Studio 2017 Client PC against a GroupShare 2015 Server it is fine.

The error is thrown when running against a GroupShare 2017 Server.