private void ExecuteNormalization(NormalizationAssignment assignment)
        {
            if (assignment == null)
            {
                throw new ArgumentNullException(nameof(assignment));
            }

            Debug.WriteLine($"Node {Id} - Running normalization on {assignment.NormalizationSubject.Name}");
            weightNormalizer.NormalizeDocument(assignment.NormalizationSubject);
            messageSink.PostNormalizedDocument(assignment.NormalizationSubject);
        }