protected StoreKeyConverter getStoreKeyConverter() {
    MockStoreKeyConverterFactory storeKeyConverterFactory = new MockStoreKeyConverterFactory(null, null);
    storeKeyConverterFactory.setConversionMap(new HashMap<>());
    storeKeyConverterFactory.setReturnInputIfAbsent(true);
    return storeKeyConverterFactory.getStoreKeyConverter();
  }
@return {@link StoreKeyConverter} used in replication.
ambry-replication/src/test/java/com/github/ambry/replication/ReplicationTestHelper.java