}
        assertTrue(labelSet.contains("existing"));
        assertTrue(labelSet.contains("label1"));
        assertTrue(labelSet.contains("label2"));
    }

    public void test_store_triggersIndexing_whenCacheSizeExceeded() {
        // Set small cache size
        indexUpdateCallback.maxDocumentCacheSize = 1;

        DataStoreParams paramMap = new DataStoreParams();