This file is indexed.

/usr/lib/xen-common/bin/xen-version is in xen-utils-common 4.1.4-3+deb7u9.

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_EXTRA="$(cat $DIR/extra)"
        if [ "$VERSION_EXTRA" = "-unstable" ]; then
            # Old xen-unstable
            VERSION=unstable
        elif [ "$VERSION_EXTRA" != "${VERSION_EXTRA#-}" ]; then
            # ABI for Lenny and smaller
            VERSION="$(cat $DIR/major).$(cat $DIR/minor)$VERSION_EXTRA"
        else
            VERSION="$(cat $DIR/major).$(cat $DIR/minor)"
        fi
    elif [ -z "$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"