This file is indexed.

/etc/audisp/plugins.d/af_unix.conf is in auditd 1:2.4.5-1ubuntu2.

This file is owned by root:root, with mode 0o640.

The actual contents of the file can be viewed below.

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# This file controls the configuration of the
# af_unix socket plugin. It simply takes events
# and writes them to a unix domain socket. This
# plugin can take 2 arguments, the path for the
# socket and the socket permissions in octal.

active = no
direction = out
path = builtin_af_unix
type = builtin 
args = 0640 /var/run/audispd_events
format = string