@Override
  public void clear(EventID eventId, Object callbackArg) {
    ClearOp.execute(pool, regionName, eventId, callbackArg);
  }
Does a region destroy on the server using the given connection.

@param con the connection to use to send to the server
@param eventId the event id for this destroy
@param callbackArg an optional callback arg to pass to any cache callbacks
geode-core/src/main/java/org/apache/geode/cache/client/internal/ServerRegionProxy.java