private void loadContextData(
            final Meta meta,
            final SizeAwareInputStream contextStream,
            final DocRef contextPipeline,
            final RefStreamDefinition refStreamDefinition,
            final RefDataStore refDataStore) {

        if (contextStream != null) {
            // Check the size of the input stream.
            final long byteCount = contextStream.size();
            // Only use context data if we actually have some.
            if (byteCount > MINIMUM_BYTE_COUNT) {
                // load the context data into the RefDataStore, so it is available for lookups
                contextDataLoader.load(
                        contextStream,
                        meta,
                        feedHolder.getFeedName(),
                        contextPipeline,
                        refStreamDefinition,
                        refDataStore);
            }
        }
    }
Get an event list from a stream that is a nested child of the current
stream context and is therefore not effective time sensitive.
i.e. a context stream attached to this stream and contains data applicable
to this stream only.
stroom-pipeline/src/main/java/stroom/pipeline/refdata/ReferenceData.java