Reduce a bind failure to trace logging (#46891)

Due to recent changes in the nio transport, a failure to bind the server
channel has started to be logged at an error level. This exception leads
to an automatic retry on a different port, so it should only be logged
at a trace level.

Author: Tim-Brooks

libs/nio/src/main/java/org/elasticsearch/nio/ServerChannelContext.java

@@ -22,6 +22,7 @@
 import org.elasticsearch.common.concurrent.CompletableContext;
 
 import java.io.IOException;
+import java.net.BindException;
 import java.net.InetSocketAddress;
 import java.net.ServerSocket;
 import java.nio.channels.ServerSocketChannel;
@@ -78,7 +79,8 @@ protected void register() throws IOException {
             rawChannel.bind(localAddress);
             bindContext.complete(null);
         } catch (IOException e) {
-            IOException exception = new IOException("Failed to bind server socket channel {localAddress=" + localAddress + "}.", e);
+            BindException exception = new BindException("Failed to bind server socket channel {localAddress=" + localAddress + "}.");
+            exception.initCause(e);
             bindContext.completeExceptionally(exception);
             throw exception;
         }

server/src/main/java/org/elasticsearch/transport/TcpTransport.java

@@ -618,7 +618,11 @@ public void onException(TcpChannel channel, Exception e) {
     }
 
     protected void onServerException(TcpServerChannel channel, Exception e) {
-        logger.error(new ParameterizedMessage("exception from server channel caught on transport layer [channel={}]", channel), e);
+        if (e instanceof BindException) {
+            logger.trace(() -> new ParameterizedMessage("bind exception from server channel caught on transport layer [{}]", channel), e);
+        } else {
+            logger.error(new ParameterizedMessage("exception from server channel caught on transport layer [{}]", channel), e);
+        }
     }
 
     protected void serverAcceptedChannel(TcpChannel channel) {