In any PGX execution mode, PGX provides a consistent RESTful API layer. However, in distributed execution mode, PGX supports a subset of the control endpoints. This page describes limitations of control RESTful endpoints, PGX distributed execution mode has. Please refer REST API Reference if you want to see the full API specification PGX supports.
/control/v1/shutdownendpoint will remove all sessions but will leave the distributed mode processes running (the user can cancel this process by sending a signal to it)