code: public void setUnindexedFaces(java.util.Collection<UnindexedFace> unindexedFaces) {
          if (unindexedFaces == null) {
              this.unindexedFaces = null;
              return;
          }
  
          this.unindexedFaces = new java.util.ArrayList<UnindexedFace>(unindexedFaces);
      }
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>
  
  @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.