docs: public CreateInstanceResponse createInstance(CreateInstanceRequest request) {
          checkNotNull(request, "request should not be null.");
          InternalRequest httpRequest = createRequest(HttpMethodName.POST,
                  MolaDbConstants.URI_INSTANCE);
          fillInHeadAndBody(request, httpRequest);
          CreateInstanceResponse ret = this.invokeHttpClient(httpRequest, CreateInstanceResponse.class);
          return ret;
      }