Describe the bug
Documentation of Data prepper says that consumer_strategy can be given either as polling or fan-out in Kinesis source config. If polling is given, polling config must be given too. Even after polling config is given and polling consumer_strategy is set in config, Kinesis Fanout Publisher is only initialised.

To Reproduce
Steps to reproduce the behavior:

  source:
    kinesis:
      streams:
        - stream_name: "test_stream"
          initial_position: LATEST
          compression: gzip
      codec:
        ndjson:
      consumer_strategy: "polling"
      records_to_accumulate: 100
      polling:
        max_polling_records: 10000
        idle_time_between_reads: 1s

Expected behavior
Kinesis source to make use of polling retrieval strategy .

Additional context
Passing of newly created retrieval config in KCL scheduler instantiation here causes this issue.