This file is indexed.

/etc/default/hwclock is in util-linux 2.29.2-1+deb9u1.

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

The actual contents of the file can be viewed below.

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# Defaults for the hwclock init script.  See hwclock(5) and hwclock(8).

# This is used to specify that the hardware clock incapable of storing
# years outside the range of 1994-1999.  Set to yes if the hardware is
# broken or no if working correctly.
#BADYEAR=no

# Set this to yes if it is possible to access the hardware clock,
# or no if it is not.
#HWCLOCKACCESS=yes

# Set this to any options you might need to give to hwclock, such
# as machine hardware clock type for Alphas.
#HWCLOCKPARS=

# Set this to the hardware clock device you want to use, it should
# probably match the CONFIG_RTC_HCTOSYS_DEVICE kernel config option.
#HCTOSYS_DEVICE=rtc0