This file is indexed.

/usr/lib/os-probes/mounted/90solaris is in os-prober 1.51ubuntu3.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
# Attempt to check if solaris is installed in this system
# looking at the /etc/system parameters file and /etc/vfstab.

set -e

. /usr/share/os-prober/common.sh

partition="$1"
dir="$2"
type="$3"

if [ -f "$dir/etc/system" ] && [ -f "$dir/etc/vfstab" ]; then
        label="$(count_next_label Solaris)"
	result "$partition:Solaris/IA32:$label:chain"
	exit 0
else
	exit 1
fi