This file is indexed.

/usr/share/lxc/config/common.conf.d/README 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 directory can be used by packages and users to dump LXC
configuration snippets which will then be used by all containers using
the common.conf configuration file (directly or indirectly).

Configuration files must end with the .conf suffix and LXC will include
those in alphabetical order.