code: @Override
      public java.util.concurrent.Future<DBCluster> failoverDBClusterAsync(com.amazonaws.handlers.AsyncHandler<FailoverDBClusterRequest, DBCluster> asyncHandler) {
  
          return failoverDBClusterAsync(new FailoverDBClusterRequest(), asyncHandler);
      }
docs: Simplified method form for invoking the FailoverDBCluster operation with an AsyncHandler.
  
  @see #failoverDBClusterAsync(FailoverDBClusterRequest, com.amazonaws.handlers.AsyncHandler)