code: public CompleteMultipartUploadRequest withPartETags(Collection<UploadPartResult> uploadPartResultsCollection) {
          for (UploadPartResult result : uploadPartResultsCollection) {
              this.partETags.add(new PartETag(result.getPartNumber(), result.getETag()));
          }
          return this;
      }
docs: Sets the list of part numbers and ETags that identify the individual
  parts of the multipart upload to complete based on the specified results
  from part uploads.
  
  @param uploadPartResultsCollection
  The list of results from the individual part uploads in the
  multipart upload to complete.
  
  @return This updated CompleteMultipartUploadRequest object.