What's wrong with this Async HystrixCommand?

I need to send notifications from time to time, I do this task asynchronously. I am using HystrixCommand as shown below to make an asynchronous RestTemplate call that doesn't work:

@HystrixCommand
    public Future<String> notify(final Query query) {
        return new AsyncResult<String>() {
            @Override
            public String invoke() {
                String result = null;
                try {
                    ResponseEntity<HashMap> restExchange = restTemplate.exchange(url,
                            HttpMethod.POST,
                            new HttpEntity<String>(mapper.writeValueAsString(queryMap), httpHeaders),
                            HashMap.class);
                    LOGGER.info("Response code from " + url + " = " + restExchange.getStatusCodeValue());
                    result = ""+ restExchange.getStatusCodeValue();
                } catch(Exception e) {
                    LOGGER.error("Exception while sending notification! Message = " + e.getMessage(), e);
                }
                return result;
            }
        };
    }

      

        
        
        
      

    

This is what I tried to do before (which didn't work either):

@HystrixCommand
    public String notify(final Query query) {
        new Thread(new Runnable() {
            @Override
            public void run() {

                try {
                    ResponseEntity<HashMap> restExchange = restTemplate.exchange(url, HttpMethod.POST,
                            new HttpEntity<String>(mapper.writeValueAsString(queryMap), httpHeaders), HashMap.class);
                    LOGGER.info("Response code from " + url + " = " + restExchange.getStatusCodeValue());

                } catch (Exception e) {
                    LOGGER.error("Exception while sending notification! Message = " + e.getMessage(), e);
                }

            }
        }).start();
    }  

      

        
        
        
      

    

PS: The reason for adding the sleuth to the tags is because doing this on a new thread does not apply to headers (baggage- *), so try to get the Hystrix team to do the trick