This file is indexed.

/etc/fonts/conf.avail/49-sansserif.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>
<!--
  If the font still has no generic name, add sans-serif
 -->
	<match target="pattern">
		<test qual="all" name="family" compare="not_eq">
			<string>sans-serif</string>
		</test>
		<test qual="all" name="family" compare="not_eq">
			<string>serif</string>
		</test>
		<test qual="all" name="family" compare="not_eq">
			<string>monospace</string>
		</test>
		<edit name="family" mode="append_last">
			<string>sans-serif</string>
		</edit>
	</match>
</fontconfig>