This file is indexed.

postinst is in gnome-icon-theme 3.12.0-1ubuntu3.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#! /bin/sh
set -e

write_cache()
{
if [ -x /usr/bin/gtk-update-icon-cache-3.0 ]; then
    if ! gtk-update-icon-cache-3.0 --force --quiet /usr/share/icons/gnome; then
        echo "WARNING: icon cache generation failed"
    fi
fi
}

if [ "$1" = "triggered" ]; then
    write_cache
    exit 0
fi

write_cache