This file is indexed.

/etc/fonts/conf.avail/51-local.conf is in fontconfig-config 2.9.0-7.1.

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

The actual contents of the file can be viewed below.

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<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
	<!-- Load local system customization file -->
	<include ignore_missing="yes">local.conf</include>
</fontconfig>