This file is indexed.

/etc/default/apache-htcacheclean is in apache2 2.4.18-2ubuntu3.

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

The actual contents of the file can be viewed below.

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# This file must only contain KEY=VALUE lines. Do not use advanced
# shell script constructs!

## run mode: cron, daemon
## run in daemon mode or as daily cron job
## default: daemon
HTCACHECLEAN_MODE=daemon

## cache size
HTCACHECLEAN_SIZE=300M

## interval: if in daemon mode, clean cache every x minutes
HTCACHECLEAN_DAEMON_INTERVAL=120

## path to cache
## must be the same as in CacheRoot directive
#HTCACHECLEAN_PATH=/var/cache/apache2/mod_cache_disk

## additional options:
## -n : be nice
## -t : remove empty directories
HTCACHECLEAN_OPTIONS="-n"