standard error not in Elisp manual index

[Drew Adams]

emacs -Q
C-h i, pick Elisp manual
i standard error => "No `standard error' in index

But:
s  standard error takes you to the top-level menu item Standard Errors

Please add `standard error' to the index. There might be other top-level
menu terms that should also be in the index.

Also, shouldn't the history of input to `i' be added to the search history,
so you could immediately try `s M-p' to get `s standard error'?

The two histories appear to be independent, but I'd think that entries
searched for in the index would also be useful in the search history.