Creates an instance of an event dispatcher sink entity.

    create [node node-id] event dispatcher -
       sink sink-name [maximum buffer size integer]

    A sink manages incoming connections and filters incoming events.
    Each sink maintains a filter that is applied to all streams that
    are assigned to that sink.  Sink-name is a simplename that
    identifies this particular event dispatcher sink instance.
    Maximum buffer size is an optional argument.

    Example:

    create event dispatcher sink local_sink