This file is indexed.

/etc/apparmor.d/lxc/lxc-default-cgns is in lxc-common 2.0.7-0ubuntu1~16.04.2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Do not load this file.  Rather, load /etc/apparmor.d/lxc-containers, which
# will source all profiles under /etc/apparmor.d/lxc

profile lxc-container-default-cgns flags=(attach_disconnected,mediate_deleted) {
  #include <abstractions/lxc/container-base>

  # the container may never be allowed to mount devpts.  If it does, it
  # will remount the host's devpts.  We could allow it to do it with
  # the newinstance option (but, right now, we don't).
  deny mount fstype=devpts,
  mount fstype=cgroup -> /sys/fs/cgroup/**,
}