docs: public INDArray getVector(@NonNull Integer key, int rowIdx) {
          /**
           * we create VoidMessage, send it, and block until it gets responded
           */
  
          VectorRequestMessage message = new VectorRequestMessage(key, rowIdx);
  
          MeaningfulMessage response = transport.sendMessageAndGetResponse(message);
  
          return response.getPayload();
      }