private Stream<RefDataOffHeapStore> getAllStoresAsStream() {
        return legacyRefDataStore != null
                ? Stream.concat(Stream.of(legacyRefDataStore), feedNameToStoreMap.values().stream())
                : feedNameToStoreMap.values().stream();
    }
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