bug#57160: 28.1.91; Info Virtual Index fails on search "two column"

[Van Ly]

Inside Emacs at  the infopage for Emacs, the search  term "two column"
finds   no   result,  the   search   term   "column"  finds   in   the
"Info Virtual Index" the result:

 . 2C-two-columns [Command Index]: Two-Column.

Steps to reproduce

 . start "emacs -Q"
 . open Emacs's infopage by "F1 i" and navigating to entry for Emacs
 . search index using "I" and type "two column"
 . echo area says "No 'two column' in index"

Expected result finds

 . 2C-two-columns [Command Index]: Two-Column.

--
vl                                           GNU Emacs 27.2 NetBSD 9.3

bug-gnu-emacs-28-1-91.text
Description: Emacs generated report