### 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
}
        if (tracerLog.isTraceEnabled() && shouldTraceAction(action)) {
            tracerLog.trace("[{}][{}] received request", requestId, action);
        }
        messageListener.onRequestReceived(requestId, action);
    }
    
    @Override
    public void onRequestSent(
        DiscoveryNode node,
        long requestId,
        String action,
        TransportRequest request,
        TransportRequestOptions options
    ) {
        if (tracerLog.isTraceEnabled() && shouldTraceAction(action)) {
            tracerLog.trace("[{}][{}] sent to [{}] (timeout: [{}])", requestId, action, node, options.timeout());
        }
        messageListener.onRequestSent(node, requestId, action, request, options);
    }
    @Override
    @SuppressWarnings("rawtypes")
    public void onResponseReceived(long requestId, Transport.ResponseContext holder) {
        if (holder == null) {
            checkForTimeout(requestId);
        } else if (tracerLog.isTraceEnabled() && shouldTraceAction(holder.action())) {
            tracerLog.trace("[{}][{}] received response from [{}]", requestId, holder.action(), holder.connection().getNode());
        }
        messageListener.onResponseReceived(requestId, holder);
    }