This file is indexed.

/usr/share/lxc/config/slackware.userns.conf is in lxc-templates 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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# This derives from the global userns config
lxc.include = /usr/share/lxc/config/userns.conf