public Optional<String> getFeedName(final RefStreamDefinition refStreamDefinition) {
        final long streamId = Objects.requireNonNull(refStreamDefinition).getStreamId();
        return metaIdToFeedStoreCache.getIfPresent(streamId)
                .map(FeedSpecificStore::feedName);
    }
Get all ref stores keyed by feed name

@return Map of feedName => {@link RefDataOffHeapStore}
stroom-pipeline/src/main/java/stroom/pipeline/refdata/store/offheapstore/DelegatingRefDataOffHeapStore.java