/usr/share/doc/xapian-tools/changelog.Debian.gz is in xapian-tools 1.2.16-2ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/xapian-tools/../libxapian22/changelog.Debian.gz
/usr/share/doc/xapian-tools/../libxapian22/changelog.Debian.gz