title: why Resonse.ok().build() return the Response entity itself?
body: <p>I have a simple REST API for which I am just returning Resonse.ok().build(), since the body of the function is asynchronous</p>
  
  <p>I was expecting an empty response with a 200 http status code, but instead I got a full description of what seems to be the Response calls as entity.</p>
  
  <p>What did I do wrong?</p>
  
  <p>Here is the json response that I received from my API call</p>
  
  <pre><code>{
      "context": {
          "headers": {},
          "entity": null,
          "entityType": null,
          "entityAnnotations": [],
          "entityStream": {
              "committed": false,
              "closed": false
          },
          "length": -1,
          "language": null,
          "location": null,
          "committed": false,
          "mediaType": null,
          "allowedMethods": [],
          "links": [],
          "entityTag": null,
          "stringHeaders": {},
          "lastModified": null,
          "date": null,
          "acceptableMediaTypes": [
              {
                  "type": "*",
                  "subtype": "*",
                  "parameters": {},
                  "quality": 1000,
                  "wildcardType": true,
                  "wildcardSubtype": true
              }
          ],
          "acceptableLanguages": [
              "*"
          ],
          "entityClass": null,
          "responseCookies": {},
          "requestCookies": {},
          "lengthLong": -1
      },
      "status": 200,
      "length": -1,
      "language": null,
      "location": null,
      "metadata": {},
      "cookies": {},
      "mediaType": null,
      "allowedMethods": [],
      "links": [],
      "statusInfo": "OK",
      "entityTag": null,
      "stringHeaders": {},
      "entity": null,
      "lastModified": null,
      "date": null,
      "headers": {}
  }
  </code></pre>
  
  <p>the REST api looks like this</p>
  
  <pre><code>@RestController
  @RequestMapping("/accountworkers")
  @Api(value = "/updater")
  public class AccountUpdater {
  
      private static Logger LOGGER = LoggerFactory.getLogger(AccountUpdater.class);
  
      @Autowired
      private AccountUpdaterController auController;
  
      @RequestMapping(value = "/updater", method = RequestMethod.GET)
      @Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
      public Response runUpdater() {
          LOGGER.info("Running account updater");
          auController.doAccountUpdateAsync();
          return Response.ok().build();
      }
  }
  </code></pre>