Fix bind failure logging for mock transport (#47150)

Currently the MockNioTransport uses a custom exception handler for
server channel exceptions. This means that bind failures are logged at
the warn level. This commit modifies the transport to use the common
TcpTransport exception handler which will log exceptions at the correct
level.

Author: Tim-Brooks

test/framework/src/main/java/org/elasticsearch/transport/nio/MockNioTransport.java

@@ -67,7 +67,6 @@
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
 import java.util.concurrent.TimeUnit;
-import java.util.function.Consumer;
 import java.util.function.IntFunction;
 import java.util.function.Supplier;
 import java.util.stream.Collectors;
@@ -220,7 +219,7 @@ public MockSocketChannel createChannel(NioSelector selector, SocketChannel chann
                 }
             };
             MockTcpReadWriteHandler readWriteHandler = new MockTcpReadWriteHandler(nioChannel, MockNioTransport.this);
-            BytesChannelContext context = new BytesChannelContext(nioChannel, selector, socketConfig, (e) -> exceptionCaught(nioChannel, e),
+            BytesChannelContext context = new BytesChannelContext(nioChannel, selector, socketConfig, e -> exceptionCaught(nioChannel, e),
                 readWriteHandler, new InboundChannelBuffer(pageSupplier));
             nioChannel.setContext(context);
             nioChannel.addConnectListener((v, e) -> {
@@ -240,10 +239,8 @@ public MockSocketChannel createChannel(NioSelector selector, SocketChannel chann
         @Override
         public MockServerChannel createServerChannel(NioSelector selector, ServerSocketChannel channel, Config.ServerSocket socketConfig) {
             MockServerChannel nioServerChannel = new MockServerChannel(channel);
-            Consumer<Exception> exceptionHandler = (e) -> logger.error(() ->
-                new ParameterizedMessage("exception from server channel caught on transport layer [{}]", channel), e);
             ServerChannelContext context = new ServerChannelContext(nioServerChannel, this, selector, socketConfig,
-                MockNioTransport.this::acceptChannel, exceptionHandler) {
+                MockNioTransport.this::acceptChannel, e -> onServerException(nioServerChannel, e)) {
                 @Override
                 public void acceptChannels(Supplier<NioSelector> selectorSupplier) throws IOException {
                     int acceptCount = 0;