'Bond servant' in the Bible

"'If thy brother that dwelleth by thee wax poor and sell himself unto thee, thou shalt not let him labour as a bondservant doeth:

For like as a bond servant desireth the shadow, and as a hireling would fain have an end of his work:

But he had sent a man before them, even Joseph which was sold to be a bond servant,

"Is Israel a bond servant, or one of the household? Why is he then so spoiled?