This file is indexed.

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

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_disk_cache.c>
# cache cleaning is done by htcacheclean, which can be configured in
# /etc/default/apache2
#
# For further information, see the comments in that file, 
# /usr/share/doc/apache2.2-common/README.Debian, and the htcacheclean(8)
# man page.

	# This path must be the same as the one in /etc/default/apache2
        CacheRoot /var/cache/apache2/mod_disk_cache

	# This will also cache local documents. It usually makes more sense to
	# put this into the configuration for just one virtual host.

	#CacheEnable disk /

        CacheDirLevels 5
        CacheDirLength 3
</IfModule>