This file is indexed.

/usr/share/X11/xkb/compat/ledcaps is in xkb-data 2.16-1ubuntu1.

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

The actual contents of the file can be viewed below.

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// Use the Caps Lock LED to show either
// Caps Lock, Group, or Shift Lock state.

default partial xkb_compatibility "caps_lock" {
    indicator "Caps Lock" {
	!allowExplicit;
	whichModState= Locked;
	modifiers= Lock;
    };
};

partial xkb_compatibility "group_lock" {
    indicator "Caps Lock" {
	modifiers= None;
	groups=All-group1;
    };
};

partial xkb_compatibility "shift_lock" {
    indicator "Caps Lock" {
	whichModState= Locked;
	modifiers= Shift;
    };
};