/usr/share/doc/python-notmuch/changelog.Debian.gz is in python-notmuch 0.17-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/python-notmuch/../libnotmuch3/changelog.Debian.gz
/usr/share/doc/python-notmuch/../libnotmuch3/changelog.Debian.gz