This file is indexed.

/usr/share/glib-2.0/schemas/10_gnome-settings-daemon-schemas.gschema.override is in gnome-settings-daemon-schemas 3.8.6.1-0ubuntu11.

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

The actual contents of the file can be viewed below.

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[org.gnome.desktop.wm.keybindings]
switch-input-source=['<Super>space']
switch-input-source-backward=['<Shift><Super>space']