This file is indexed.

/etc/fonts/conf.avail/90-ttf-tamil-fonts.conf is in ttf-indic-fonts-core 1:0.5.11ubuntu1.

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>
	<!-- Tamil (ta) -->
	<match target="pattern">
		<test name="lang" compare="contains">
			<string>ta</string>
		</test>
		<test qual="any" name="family">
			<string>sans-serif</string>
		</test>
		<edit name="family" mode="append" binding="same">
			<string>Lohit Tamil</string>
		</edit>
	</match>

	<match target="pattern">
		<test name="lang" compare="contains">
			<string>ta</string>
		</test>
		<test qual="any" name="family">
			<string>serif</string>
		</test>
		<edit name="family" mode="append" binding="same">
			<string>Lohit Tamil</string>
		</edit>
	</match>

    <!-- TAM* and TSC* fonts use a custom legacy encoding and should never be picked by fontconfig -->
    <selectfont>
        <rejectfont>
            <pattern>
            	<patelt name="family"><string>TAMu_Kadambri</string></patelt>
            	<patelt name="family"><string>TAMu_Kalyani</string></patelt>
            	<patelt name="family"><string>TAMu_Maduram</string></patelt>
            	<patelt name="family"><string>TSCu_Comic</string></patelt>
            	<patelt name="family"><string>TSCu_Paranar</string></patelt>
            	<patelt name="family"><string>TSCu_Times</string></patelt>
            </pattern>
        </rejectfont>
    </selectfont>
    <!-- Tamil (ta) ends -->

</fontconfig>