This file is indexed.

/usr/lib/x86_64-linux-gnu/libboost_thread.so is in libboost-thread1.54-dev 1.54.0-4ubuntu3.

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

It is a symlink to /usr/lib/x86_64-linux-gnu/libboost_thread.so.1.54.0