elasticsearch-jdbc
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PostgreSQL 10 and elasticsearch 6.7
[2019-04-05T19:22:12,661][WARN ][o.e.t.TcpTransport ] [Nd5aFRV] exception caught on transport layer [Netty4TcpChannel{localAddress=/127.0.0.1:9300, remoteAddress=/127.0.0.1:54592}], closing connection java.lang.IllegalStateException: Received message from unsupported version: [2.0.0] minimal compatible version is: [5.6.0]