This file is indexed.

/usr/share/elvis/scripts/shade.ex is in elvis-common 2.2.0-11.1.

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

The actual contents of the file can be viewed below.

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"This script defines the hlobjectN colors as being shades of gray
set hllayers=9
switch current("background")
case light {
 for i (1 ... hllayers)
 do eval color hlobject(i) on gray(90 - 3*i)
}
case dark {
 for i (1 ... hllayers)
 do eval color hlobject(i) on gray(10 + 4*i)
}