Plus additional question: did you also already encounter errors like:
[prefetch-cache-shardId-000000000159-0000] ERROR software.amazon.kinesis.retrieval.polling.PrefetchRecordsPublisher - production-enriched-good:shardId-000000000159 : Exception thrown while fetching records from Kinesis
software.amazon.awssdk.core.exception.SdkClientException: Unable to execute HTTP request: Java heap space
After some time the RDB Loader always hits the Java heap space limit (even after manually increasing the heap space) via Java Options :-/