private static IFieldAggregator CreateAggregator(AggregatorDefinition aggregatorDefinition, AggregateManager aggregateManager)
        {
            var aggregator = StoreManager.AggregatorStore.CreateObject(aggregatorDefinition.Aggregator);

            aggregator.Description = aggregatorDefinition.Description;
            aggregator.Name        = aggregatorDefinition.Name;
            aggregator.Aggregate   = aggregateManager.GetAggregateByName(aggregator.Name);

            return(aggregator);
        }