public void OnDocumentsIndexed(IEnumerable <Document> documents, Analyzer searchAnalyzer)
        {
            var indexingPerformanceStats = new IndexingPerformanceStats {
                Operation = _operationText, Started = SystemTime.UtcNow
            };

            _indexInstance.AddindexingPerformanceStat(indexingPerformanceStats);

            var sp = Stopwatch.StartNew();
            var enumerableDictionary = new EnumerableDictionary(documents, field, searchAnalyzer);

            spellChecker.IndexDictionary(enumerableDictionary, workContext.CancellationToken);

            indexingPerformanceStats.Duration    = sp.Elapsed;
            indexingPerformanceStats.InputCount  = enumerableDictionary.NumberOfDocuments;
            indexingPerformanceStats.ItemsCount  = enumerableDictionary.NumberOfTokens;
            indexingPerformanceStats.OutputCount = enumerableDictionary.NumberOfFields;
        }