### 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
}
        
        assertBusy(() -> {
            assertThat(tracerA.requestsReceived.get(), equalTo(2));
            assertThat(tracerA.requestsSent.get(), equalTo(2));
            assertThat(tracerA.responseReceived.get(), equalTo(2));
            assertThat(tracerA.responseSent.get(), equalTo(2));
            assertThat(tracerB.requestsReceived.get(), equalTo(1));
            assertThat(tracerB.requestsSent.get(), equalTo(1));
            assertThat(tracerB.responseReceived.get(), equalTo(1));
            assertThat(tracerB.responseSent.get(), equalTo(1));
        });
    }
    public void testVoidMessageCompressed() throws Exception {
        try (MockTransportService serviceC = buildService("TS_C", CURRENT_VERSION, Settings.EMPTY)) {
            serviceA.registerRequestHandler(
                "internal:sayHello",
                ThreadPool.Names.GENERIC,
                TransportRequest.Empty::new,
                (request, channel, task) -> {
                    try {
                        channel.sendResponse(TransportResponse.Empty.INSTANCE);
                    } catch (IOException e) {
                        logger.error("Unexpected failure", e);
                        fail(e.getMessage());
                    }
                }
            );
            Settings settingsWithCompress = Settings.builder()
                .put(TransportSettings.TRANSPORT_COMPRESS.getKey(), Compression.Enabled.TRUE)