docs: public DeleteInstanceResponse deleteInstance(DeleteInstanceRequest request) {
          checkNotNull(request, "request should not be null.");
          InternalRequest httpRequest = createRequest(HttpMethodName.DELETE,
                  MolaDbConstants.URI_INSTANCE,
                  request.getInstanceName());
          DeleteInstanceResponse ret = this.invokeHttpClient(httpRequest, DeleteInstanceResponse.class);
          return ret;
      }