This file is indexed.

/usr/share/help/cs/xchat-gnome/index.docbook is in xchat-gnome-common 1:0.30.0~git20141005.816798-0ubuntu9.

This file is owned by root:root, with mode 0o777.

It is a symlink to /usr/share/help/cs/xchat-gnome/../../../help-langpack/cs/xchat-gnome/index.docbook