Ebedmelech the Cushite was a high ranking official under King Zedekiah, but why is he called a servant in some translations?

Jeremiah 38:7. Now when Ebedmelech the Cushite, an officer who was in the king’s house, heard that they had put Jeremiah in the cistern, the king then sitting in the gate of Benjamin, 8. Ebedmelech went out of the king’s house and spoke to the king saying, 9. My lord the king, these men have done evil in all that they have done to Jeremiah the prophet, whom they have cast into the cistern. And he is likely to die for hunger in the place where he is, for there is no more bread in the city. 10. Then the king commanded Ebedmelech the Cushite saying, Take thirty men from here with you and take Jeremiah the prophet up out of the cistern before he dies. 11. So Ebedmelech took the men with him and went into the house of the king under the treasury and took from there old worn cloths and old rotten rags and let them down by ropes into the pit to Jeremiah.