This file is indexed.

/etc/fonts/conf.avail/10-no-sub-pixel.conf is in fontconfig-config 2.11.0-0ubuntu4.2.

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>
<!--  Enable sub-pixel rendering --> 
  <match target="pattern">
    <!--
      This configuration is available on the major desktop environments.
      We shouldn't overwrite it with "assign" unconditionally.
      Most clients may picks up the first value only. so using "append"
      may simply works to avoid it.
    -->
    <edit name="rgba" mode="append"><const>none</const></edit>
  </match>
</fontconfig>