当在Processor的onTrigger中添加好业务代码后，需要指定 Relationship，及数据将从哪个 Relationship流动，代码如下
session.transfer(flowFile, REL_SUCCESS);
如果没有指定话，则会报transfer relationship not specified的错误提示。
2、为processor添加service时，报 No controller service types found that are applicable for this property.
在processor所在的nar包中，MANIFEST.MF中未添加依赖的service
Nar-Dependency-Id: nifi-XXX-api-nar