Is it considered good practice to include chapter/section main topic words into the subject index? Suppose I have a section on Foobar. It naturally frequently mentions foobars. Should I include any/all of them into the index?
Looking at a couple of examples, it looks like they usually list all references, but group them together.
Foobar, 24, 38-45, 117
Just from looking at these numbers, the reader will be able to tell that they'll get more information about foobars in the longer section (possibly a chapter) starting at page 38.