Info-virtual-index-nodes

Info-virtual-index-nodes is a variable defined in `info.el'.
Its value is

nil

Documentation:
Alist of cached matched index search nodes.
Each element is ((FILENAME . TOPIC) MATCHES) where
FILENAME is the file name of the manual,
TOPIC is the search string given as an argument to `Info-virtual-index',
MATCHES is a list of index matches found by `Info-index'.