This file is indexed.

/usr/share/ibus/keymaps/modifiers is in ibus 1.4.1-3ubuntu1.

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

The actual contents of the file can be viewed below.

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keycode 29 = Control_L
keycode 42 = Shift_L
keycode 54 = Shift_R
keycode 56 = Alt_L
keycode 97 = Control_R
keycode 100 = Alt_R
keycode 125 = Super_L
keycode 126 = Super_R
keycode 127 = Menu