This file is indexed.

/etc/fonts/conf.avail/10-hinting.conf is in fontconfig-config 2.11.94-0ubuntu1.1.

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>
<!--  Use Hinting --> 
  <match target="font">
    <edit name="hinting" mode="assign"><bool>true</bool></edit>
  </match>
</fontconfig>