This file is indexed.

/usr/share/X11/xkb/compat/lednum is in xkb-data 2.12-1.

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 Num Lock LED to show either
// Num Lock, Group, or Shift Lock state.

default partial xkb_compatibility "num_lock" {
    indicator "Num Lock" {
	!allowExplicit;
	whichModState= Locked;
	modifiers= NumLock;
    };
};

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

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