This file is indexed.

/etc/menu-methods/README is in menu 2.1.47ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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In this directory the scripts files for the install programme
of the various window managers are situated.

update-menus runs all files in this directory, passing it all menuentries
to install on stdin.

The filenames in this directory must contain only letters/numbers or -_
any other files (like the .bak, .dpkg-old, ...) are silently ignored.

For more info, see /usr/share/doc/menu/html