docs: public RecognizeCelebritiesResult withUnrecognizedFaces(ComparedFace... unrecognizedFaces) {
          if (this.unrecognizedFaces == null) {
              setUnrecognizedFaces(new java.util.ArrayList<ComparedFace>(unrecognizedFaces.length));
          }
          for (ComparedFace ele : unrecognizedFaces) {
              this.unrecognizedFaces.add(ele);
          }
          return this;
      }