code: public void releaseVolume(ReleaseVolumeRequest request) {
          checkNotNull(request, "request should not be null.");
          checkStringNotEmpty(request.getVolumeId(), "request volumeId should not be empty.");
          InternalRequest internalRequest =
                  this.createRequest(request, HttpMethodName.DELETE, VOLUME_PREFIX, request.getVolumeId());
          invokeHttpClient(internalRequest, AbstractBceResponse.class);
      }
docs: Releasing the specified volume owned by the user.
  
  You can release the specified volume only
  when the volume is Available/Expired/Error,
  otherwise,it's will get <code>409</code> errorCode.
  
  @param request The request containing all options for releasing the specified volume.