This file is indexed.

/lib/modules/4.2.0-22-lowlatency/build is in linux-headers-4.2.0-22-lowlatency 4.2.0-22.27~14.04.1.

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

It is a symlink to /usr/src/linux-headers-4.2.0-22-lowlatency