This file is indexed.

/etc/default/ntpdate is in ntpsec-ntpdate 1.1.0+dfsg1-1.

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

The actual contents of the file can be viewed below.

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# The settings in this file are used by the program ntpdate-ubuntu, but not
# by the upstream program ntpdate.

# Set to "yes" to take the server list from /etc/ntp.conf, from package ntp,
# so you only have to keep it in one place.
NTPDATE_USE_NTP_CONF=yes

# List of NTP servers to use  (Separate multiple servers with spaces.)
# Not used if NTPDATE_USE_NTP_CONF is yes.
NTPSERVERS="ntp.ubuntu.com"

# Additional options to pass to ntpdate
NTPOPTIONS=""