code: public ServiceFuture<List<SimilarFace>> findSimilarAsync(UUID faceId, FindSimilarOptionalParameter findSimilarOptionalParameter, final ServiceCallback<List<SimilarFace>> serviceCallback) {
          return ServiceFuture.fromResponse(findSimilarWithServiceResponseAsync(faceId, findSimilarOptionalParameter), serviceCallback);
      }
docs: Given query face's faceId, find the similar-looking faces from a faceId array or a faceListId.
  
  @param faceId FaceId of the query face. User needs to call Face - Detect first to get a valid faceId. Note that this faceId is not persisted and will expire 24 hours after the detection call
  @param findSimilarOptionalParameter the object representing the optional parameters to be set before calling this API
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object