I’m sure that many of us do get referrals from book designers and/or cover designers–I certainly do. Those referrals give me a fantastic variety of work that I enjoy immensely although I’ve seldom had occasion to discuss the index with either of them.
(The view from my office door on a rain day–that makes me so happy to be working from home. Chilly rainy days can be such good working days! Especially if you’re enjoying wonderful aromas from cooking drifting in from the kitchen.)