IndexDownloader does not set IndexStatus after downloading an index

I found it necessary to set the index status after downloading an index in IndexDownloader.downloadIndex(..)

Just before the finally I added

book.deactivate(null);
book.activate(null);
book.setIndexStatus(IndexStatus.DONE);

I think the deactivation and reactivation is probably unnecessary but believe the index status needs to be set. In other words my code started working after I added setIndexStatus but not before.