Spring Boot + Eureka Server + Hystrix with Turbine: empty turbine.stream 配置的时候遇到了问题：
Property or field 'default' cannot be found on object of type 'com.netflix.appinfo.InstanceInfo' - m
原配置：
turbine:
app-config: eureka-consumer-ribbon-hystrix
cluster-name-expression: “default”
combine-host-port: true
解决方案
turbine:
app-config: eureka-consumer-ribbon-hystrix
cluster-name-expression: new String('default')
combine-host-port: true
