This file is indexed.

/usr/lib/x86_64-linux-gnu/libKF5MessageComposer.so.5 is in libkf5messagecomposer5 4:15.12.3-0ubuntu1.

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

It is a symlink to /usr/lib/x86_64-linux-gnu/libKF5MessageComposer.so.5.1.3