### Description

The `sendRequest` method is asynchronous and notifies a 
`TransportResponseHandler` when it completes the excecution
(successfully or unsuccessfully). 

When opening the connection we only catch `NodeNotConnectedException`
( https://github.com/elastic/elasticsearch/blob/main/server/src/main/java/org/elasticsearch/transport/TransportService.java#L719 ) which is currently fine as no implementations
throw other type of exception however, it'd be best to catch `Exception` here
so the `handler` gets notified of potential exceptions (as opposed to the caller
having to `try/catch` the call to `sendRequest`)
test/framework/src/main/java/org/elasticsearch/transport/AbstractSimpleTransportTestCase.java
value = "org.elasticsearch.transport.TransportService.tracer:trace",
        reason = "to ensure we log network events on TRACE level"
    )
    public void testTracerLog() throws Exception {
        TransportRequestHandler<TransportRequest> handler = (request, channel, task) -> channel.sendResponse(new StringMessageResponse(""));
        TransportRequestHandler<StringMessageRequest> handlerWithError = (request, channel, task) -> {
            if (request.timeout() > 0) {
                Thread.sleep(request.timeout);
            }
            channel.sendResponse(new RuntimeException(""));
        };
        TransportResponseHandler<StringMessageResponse> noopResponseHandler = new TransportResponseHandler<StringMessageResponse>() {
            @Override
            public StringMessageResponse read(StreamInput in) throws IOException {
                return new StringMessageResponse(in);
            }
            @Override
            public void handleResponse(StringMessageResponse response) {}
            @Override
            public void handleException(TransportException exp) {}
        };
        serviceA.registerRequestHandler("internal:test", ThreadPool.Names.SAME, StringMessageRequest::new, handler);
        serviceA.registerRequestHandler("internal:testNotSeen", ThreadPool.Names.SAME, StringMessageRequest::new, handler);
        serviceA.registerRequestHandler("internal:testError", ThreadPool.Names.SAME, StringMessageRequest::new, handlerWithError);
        serviceB.registerRequestHandler("internal:test", ThreadPool.Names.SAME, StringMessageRequest::new, handler);
        serviceB.registerRequestHandler("internal:testNotSeen", ThreadPool.Names.SAME, StringMessageRequest::new, handler);
        serviceB.registerRequestHandler("internal:testError", ThreadPool.Names.SAME, StringMessageRequest::new, handlerWithError);
        String includeSettings;
        String excludeSettings;
        if (randomBoolean()) {