@JsonPropertyDescription("Determines which statistic store(s) internal statistic events will be sent to. " +
                             "Valid values are \"" + StatisticStoreDoc.TYPE + "\" and \"" + StroomStatsStoreDoc.TYPE +
                             "\". An empty list means all internal statistic events will be dropped.")
    @JsonProperty("enabledStoreTypes")
    @IsSubsetOf(allowedValues = {
            StatisticStoreDoc.TYPE,
            StroomStatsStoreDoc.TYPE})
    public List<String> getEnabledStoreTypes() {
        return enabledStoreTypes;
    }
Create a list of {@link DocRef} objects that are associated with a single {@link InternalStatisticKey}
stroom-statistics/stroom-statistics-impl/src/main/java/stroom/statistics/impl/InternalStatisticsConfig.java