'Servant' in the Bible

Is Israel a servant? Is he a native-born [slave]? Why has he become a prey?

behold, I will send and take all the families of the north, says Yahweh, and [I will send] to Nebuchadnezzar the king of Babylon, my servant, and will bring them against this land, and against its inhabitants, and against all these nations around; and I will utterly destroy them, and make them an astonishment, and a hissing, and perpetual desolations.

Now have I given all these lands into the hand of Nebuchadnezzar the king of Babylon, my servant; and the animals of the field also have I given him to serve him.

Therefore don't you be afraid, O Jacob my servant, says Yahweh; neither be dismayed, Israel: for, behold, I will save you from afar, and your seed from the land of their captivity; and Jacob shall return, and shall be quiet and at ease, and none shall make him afraid.

then may also my covenant be broken with David my servant, that he shall not have a son to reign on his throne; and with the Levites the priests, my ministers.

As the army of the sky can't be numbered, neither the sand of the sea measured; so will I multiply the seed of David my servant, and the Levites who minister to me.

then will I also cast away the seed of Jacob, and of David my servant, so that I will not take of his seed to be rulers over the seed of Abraham, Isaac, and Jacob: for I will cause their captivity to return, and will have mercy on them.

that every man should let his male servant, and every man his female servant, who is a Hebrew or a Hebrewess, go free; that none should make bondservants of them, [to wit], of a Jew his brother.

All the princes and all the people obeyed, who had entered into the covenant, that everyone should let his male servant, and everyone his female servant, go free, that none should make bondservants of them any more; they obeyed, and let them go:

but you turned and profaned my name, and caused every man his servant, and every man his handmaid, whom you had let go free at their pleasure, to return; and you brought them into subjection, to be to you for servants and for handmaids.

and tell them, Thus says Yahweh of Armies, the God of Israel: Behold, I will send and take Nebuchadnezzar the king of Babylon, my servant, and will set his throne on these stones that I have hidden; and he shall spread his royal pavilion over them.

But don't you be afraid, Jacob my servant, neither be dismayed, Israel: for, behold, I will save you from afar, and your seed from the land of their captivity; and Jacob shall return, and shall be quiet and at ease, and none shall make him afraid.

Don't you be afraid, O Jacob my servant, says Yahweh; for I am with you: for I will make a full end of all the nations where I have driven you; but I will not make a full end of you, but I will correct you in measure, and will in no way leave you unpunished.