API: https://docs.confluent.io/platform/current/kafka-rest/api.html#consumers
Issue affects approx 5-10 % requests and is evident during high traffic.

Kafka rest version: v7.2.1

Steps to reproduce:

• Create multple consumers for a group and start calling /records API (keep consuming)
• There should be active conumers consuming, at this point send a bunch of create new consumer request (100-500 consumer creation).
• Try above steps multiple times and you should see few consumer creation request will take longer (longer request timerange 20-200 seconds)