public RefDataStore getOffHeapStore(final RefStreamDefinition refStreamDefinition) {
        return offHeapRefDataStore.getEffectiveStore(refStreamDefinition);
    }
@return A store specific to the feed of this refStreamDefinition. Use this when you know you
are only dealing with a single ref stream, e.g. during a load.
stroom-pipeline/src/main/java/stroom/pipeline/refdata/store/RefDataStoreFactory.java