code: public IndexFacesResult withUnindexedFaces(UnindexedFace... unindexedFaces) {
          if (this.unindexedFaces == null) {
              setUnindexedFaces(new java.util.ArrayList<UnindexedFace>(unindexedFaces.length));
          }
          for (UnindexedFace ele : unindexedFaces) {
              this.unindexedFaces.add(ele);
          }
          return this;
      }
docs: <p>
  An array of faces that were detected in the image but weren't indexed. They weren't indexed because the quality
  filter identified them as low quality, or the <code>MaxFaces</code> request parameter filtered them out. To use
  the quality filter, you specify the <code>QualityFilter</code> request parameter.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setUnindexedFaces(java.util.Collection)} or {@link #withUnindexedFaces(java.util.Collection)} if you want
  to override the existing values.
  </p>
  
  @param unindexedFaces
  An array of faces that were detected in the image but weren't indexed. They weren't indexed because the
  quality filter identified them as low quality, or the <code>MaxFaces</code> request parameter filtered
  them out. To use the quality filter, you specify the <code>QualityFilter</code> request parameter.
  @return Returns a reference to this object so that method calls can be chained together.