code: public IndexFacesResult withFaceRecords(FaceRecord... faceRecords) {
          if (this.faceRecords == null) {
              setFaceRecords(new java.util.ArrayList<FaceRecord>(faceRecords.length));
          }
          for (FaceRecord ele : faceRecords) {
              this.faceRecords.add(ele);
          }
          return this;
      }
docs: <p>
  An array of faces detected and added to the collection. For more information, see Searching Faces in a Collection
  in the Amazon Rekognition Developer Guide.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setFaceRecords(java.util.Collection)} or {@link #withFaceRecords(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param faceRecords
  An array of faces detected and added to the collection. For more information, see Searching Faces in a
  Collection in the Amazon Rekognition Developer Guide.
  @return Returns a reference to this object so that method calls can be chained together.