This file is indexed.

/etc/sudoers.d/10-ubuntu-core-secure-path is in ubuntu-core-config 0.6.40.

This file is owned by root:root, with mode 0o440.

The actual contents of the file can be viewed below.

1
Defaults        secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin"