Dauber01 opened a new issue #3268: nacos and 6.2.0 URL: https://github.com/apache/skywalking/issues/3268 i used the 6.2.0,use nacos as the cluster,then i run three skywalking oap instance,and in nacos it show like this ![image](https://user-images.githubusercontent.com/28582852/63011118-3beb9480-beba-11e9-8372-bcd65c2f54b8.png) and one instance throw exception like this,i have clear the elastic search before i update 6.1.0 to 6.2.0
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