/usr/lib/x86_64-linux-gnu/libnotmuch.so.4

This file is indexed.

/usr/lib/x86_64-linux-gnu/libnotmuch.so.4 is in libnotmuch4 0.23.7-3.

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

It is a symlink to /usr/lib/x86_64-linux-gnu/libnotmuch.so.4.4.0