public String startWorkflow(StartWorkflowRequest startWorkflowRequest) {
        Preconditions.checkNotNull(startWorkflowRequest, "StartWorkflowRequest cannot be null");
        return stub.startWorkflow(protoMapper.toProto(startWorkflowRequest)).getWorkflowId();
    }
Starts a workflow

@param startWorkflowRequest the {@link StartWorkflowRequest} object to start the workflow
@return the id of the workflow instance that can be used for tracking
grpc-client/src/main/java/com/netflix/conductor/client/grpc/WorkflowClient.java