public static void execute(ExecutablePool pool, String region, EventID eventId,
      Object callbackArg) {
    AbstractOp op = new ClearOpImpl(region, eventId, callbackArg);
    pool.execute(op);
  }
Does a region clear on a server using connections from the given pool to communicate with the
server.

@param pool the pool to use to communicate with the server.
@param region the name of the region to do the clear on
@param eventId the event id for this clear
@param callbackArg an optional callback arg to pass to any cache callbacks
geode-core/src/main/java/org/apache/geode/cache/client/internal/ClearOp.java