Hastings' Dictionary of the New Testament
In the only passages in which this word occurs in the apostolic writings (Acts 5:22; Acts 5:26), it stands for the Gr. ὑπηρέτης, and denotes an official of the Sanhedrin sent to bring the apostles before the Court. These officials appear to have been under the command of the captain of the Temple (v. 26).
G. Wauchope Stewart.
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Hastings, James. Entry for 'Officer'. Hastings' Dictionary of the New Testament. https://www.studylight.org/dictionaries/eng/hdn/o/officer.html. 1906-1918.