### 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`)
server/src/main/java/org/elasticsearch/transport/TransportService.java
TransportInterceptor transportInterceptor,
        Function<BoundTransportAddress, DiscoveryNode> localNodeFactory,
        @Nullable ClusterSettings clusterSettings,
        ConnectionManager connectionManager,
        TaskManager taskManger,
        Tracer tracer
    ) {
        this.transport = transport;
        transport.setSlowLogThreshold(TransportSettings.SLOW_OPERATION_THRESHOLD_SETTING.get(settings));
        this.threadPool = threadPool;
        this.localNodeFactory = localNodeFactory;
        this.connectionManager = connectionManager;
        this.tracer = tracer;
        this.clusterName = ClusterName.CLUSTER_NAME_SETTING.get(settings);
        setTracerLogInclude(TransportSettings.TRACE_LOG_INCLUDE_SETTING.get(settings));
        setTracerLogExclude(TransportSettings.TRACE_LOG_EXCLUDE_SETTING.get(settings));
        tracerLog = Loggers.getLogger(logger, ".tracer");
        this.taskManager = taskManger;
        this.interceptor = transportInterceptor;
        this.asyncSender = interceptor.interceptSender(this::sendRequestInternal);
        this.remoteClusterClient = DiscoveryNode.isRemoteClusterClient(settings);
        remoteClusterService = new RemoteClusterService(settings, this);
        responseHandlers = transport.getResponseHandlers();
        if (clusterSettings != null) {
            clusterSettings.addSettingsUpdateConsumer(TransportSettings.TRACE_LOG_INCLUDE_SETTING, this::setTracerLogInclude);
            clusterSettings.addSettingsUpdateConsumer(TransportSettings.TRACE_LOG_EXCLUDE_SETTING, this::setTracerLogExclude);
            if (remoteClusterClient) {
                remoteClusterService.listenForUpdates(clusterSettings);
            }
            clusterSettings.addSettingsUpdateConsumer(TransportSettings.SLOW_OPERATION_THRESHOLD_SETTING, transport::setSlowLogThreshold);