private IEnumerable <string> GetIndexNames()
        {
            IIndexResolver resolver              = ResolverFactory.GetIndexResolver(IndexType.SearchIndex);
            List <String>  normalIndexes         = resolver.GetIndexNames();
            IIndexResolver contentSearchResolver = ResolverFactory.GetIndexResolver(IndexType.ContentSearch);
            List <String>  contentSearchIndexes  = contentSearchResolver.GetIndexNames();

            normalIndexes.AddRange(contentSearchIndexes);
            return(normalIndexes);
        }