This file is indexed.

/etc/cron.daily/changetrack is in changetrack 4.7-4.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

##
## This code was put in the Public Domain by Jens Peter Secher.
##

## No arms, no cookies
PROGRAM=/usr/bin/changetrack
[ -x $PROGRAM ] || exit 0

## Get default settings
[ -r /etc/default/changetrack ] && . /etc/default/changetrack

## Clear list of tracked files
cat /dev/null > ${CONFFILES_LIST:?}

## Collect administrators choice of tracked files
[ -r /etc/changetrack.conf ] && cat /etc/changetrack.conf >> $CONFFILES_LIST

if [ "${AUTO_TRACK_ALL_CONFFILES}" = "yes" ]; then

    ## Collect all conffiles known to dpkg, except for gnome schema
    ## files since they get very large and their diff is not of much
    ## use.
    nice \
    find /var/lib/dpkg/info -name '*.conffiles' -exec grep -v '.schemas$' '{}' ';' | \
    sort | uniq >> $CONFFILES_LIST
fi

## The actual tracking is performed by /etc/cron.hourly/changetrack