Stephen-sen commented on issue #2172: class[class com.alibaba.dubbo.monitor.support.MonitorFilter] after method[invoke] intercept failure java.lang.NullPointerException URL: https://github.com/apache/incubator-skywalking/issues/2172#issuecomment-457432941 hi,I have find the reason that cause that npe, that is elasticsearch-5.x-plugin's bug.when i grade es version to 5.6.6,all is ok.so I'm the question is caused by es version . our es version is 2.4.6, and java es version is 2.4.4.form [https://github.com/SkywalkingTest/agent-integration-test-report/blob/master/2018/12/ascrutae/testReport-master-2018-12-02-16-56.md](url) I find it don't support 2.x。but our applacation upgrade version is hard，because it involves many applications.so I hope you resove this problem.thank's!
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