This file is indexed.

/etc/dconf/db/gdm.d/00-upstream-settings is in gdm 3.10.0.1-0ubuntu3.

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 is part of the GDM packaging and should not be changed.
#
# Instead create your own file next to it with a higher numbered prefix,
# and run
#
#       dconf update
#

[org/gnome/desktop/a11y/keyboard]
enable=true

[org/gnome/desktop/background]
show-desktop-icons=false

[org/gnome/desktop/default-applications/terminal]
exec='/bin/true'

[org/gnome/desktop/interface]
toolkit-accessibility=true

[org/gnome/desktop/lockdown]
disable-application-handlers=true
disable-command-line=true
disable-lock-screen=true
disable-log-out=false
disable-printing=true
disable-print-setup=true
disable-save-to-disk=true
disable-user-switching=true

[org/gnome/desktop/session]
session-name='gdm-shell'

[org/gnome/desktop/sound]
event-sounds=true

[org/gnome/settings-daemon/plugins]
whitelisted-plugins=['a11y-keyboard', 'a11y-settings', 'background', 'clipboard', 'color', 'cursor', 'keyboard', 'media-keys', 'orientation', 'power', 'smartcard', 'sound', 'xrandr', 'xsettings']

[org/gnome/settings-daemon/plugins/media-keys]
calculator=''
eject=''
email=''
help=''
home=''
media=''
next=''
pause=''
play=''
previous=''
screensaver=''
search=''
stop=''
www=''

[org/gnome/settings-daemon/peripherals/input-devices]
hotplug-command=''