This file is indexed.

/usr/lib/x86_64-linux-gnu/libfftw3f_threads.so.3 is in libfftw3-single3 3.3.3-7ubuntu3.

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

It is a symlink to /usr/lib/x86_64-linux-gnu/libfftw3f_threads.so.3.3.2