When running PreBuiltTransportClient in ES 5.1 environment, the following error occurs.
it is my pom.xml
I deleted the 2.3 version, and registered the 5.1 version of the transport.


and i changed the log4j
version 2.4.1 to 2.7.
Does maven dependency:tree show the netty 3 plugin included with the
transport client dependency? It should....
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