docs: public void releaseInstance(ReleaseInstanceRequest request) {
          checkNotNull(request, "request should not be null.");
          checkStringNotEmpty(request.getInstanceId(), "request instanceId should not be empty.");
          InternalRequest internalRequest = this.createRequest(
                  request, HttpMethodName.DELETE, INSTANCE_PREFIX, request.getInstanceId());
          this.invokeHttpClient(internalRequest, AbstractBceResponse.class);
      }