GraphXGraphGenerator Usage Help

[John Smith]

I'm trying to use the GraphXGraphGenerator class but it is hard coded to
use the EntityCentricIndex table by default.  But this doesn't exist in Rya
by default.  Shouldn't this default to the SPO table?  Or perhaps even
better, be a configurable parameter?  What is the purpose of the
EntityCentricIndex ?  How do I enable it?