This file is indexed.

/usr/lib/xen-common/bin/xen-version is in xen-utils-common 4.4.1-9+deb8u10.

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 -e

error() {
    echo "ERROR: " "$@" >&2
    exit 1
}

if [ -e "/sys/hypervisor/type" ]; then
    type="$(cat /sys/hypervisor/type)"
    if [ "$type" = xen ]; then
        DIR=/sys/hypervisor/version
        VERSION="$(cat $DIR/major).$(cat $DIR/minor)"
    elif [ -z "$type" ]; then
        error "Can't read hypervisor type from sysfs!"
    else
        error "Hypervisor is not xen but '$type'!"
    fi
else
    error "Can't find hypervisor information in sysfs!"
fi

echo "$VERSION"