This file is indexed.

/etc/apache2/mods-available/dir.conf is in apache2.2-common 2.2.22-1ubuntu1.11.

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

The actual contents of the file can be viewed below.

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<IfModule mod_dir.c>

          DirectoryIndex index.html index.cgi index.pl index.php index.xhtml index.htm

</IfModule>