private InternalStatisticsService getServiceForType(final String type) {
        InternalStatisticsService service = docRefTypeToServiceMap.get(type);
        if (service == null) {
            LOGGER.warn("No InternalStatisticsService for type {}", type);
        }
        return service;
    }
Passes the internal statistic events to zero-many {@link InternalStatisticsService} instances
as defined by the docRefTypeToServiceMap
stroom-statistics/stroom-statistics-impl/src/main/java/stroom/statistics/impl/MultiServiceInternalStatisticsReceiver.java