Provide better error message when an incompatible node connects to a node

We should give a better exception message when an incompatible node connects
and we receive a messeage. This commit adds a clear excpetion based on the
protocol version received instead of throwing cryptic messages about not fully reaed
buffer etc.

Relates to #17090

core/src/main/java/org/elasticsearch/transport/netty/MessageChannelHandler.java

@@ -127,6 +127,10 @@ public class MessageChannelHandler extends SimpleChannelUpstreamHandler {
                 }
                 streamIn = compressor.streamInput(streamIn);
             }
+            if (version.onOrAfter(Version.CURRENT.minimumCompatibilityVersion()) == false || version.major != Version.CURRENT.major) {
+                throw new IllegalStateException("Received message from unsupported version: [" + version
+                    + "] minimal compatible version is: [" +Version.CURRENT.minimumCompatibilityVersion() + "]");
+            }
             streamIn.setVersion(version);
             if (TransportStatus.isRequest(status)) {
                 threadContext.readHeaders(streamIn);