Just-In-Time Indexing
http://www.allegrotechindexing.com/news016.htm

Brown, Fred
Allegro Time!
2001

Abstract:

Indexing often waits until a document is nearly finalized or “camera ready.” This is because indexers often need to have the final page numbers or the original document files before starting. But, starting the index so late means extending the publication process by several days or even weeks. And the time available to create a quality index — likely the most well-used part of any business or technical publication — can be severely squeezed.