public void setConsumerGroupId(String consumerGroupId) {
        this.consumerGroupId = consumerGroupId;
    }
<p>
The identifier for the Kafka consumer group to join. The consumer group ID must be unique among all your Kafka
event sources. After creating a Kafka event source mapping with the consumer group ID specified, you cannot
update this value. For more information, see <a
href="https://docs.aws.amazon.com/lambda/latest/dg/with-msk.html#services-msk-consumer-group-id">Customizable
consumer group ID</a>.
</p>

@param consumerGroupId
       The identifier for the Kafka consumer group to join. The consumer group ID must be unique among all your
       Kafka event sources. After creating a Kafka event source mapping with the consumer group ID specified, you
       cannot update this value. For more information, see <a
       href="https://docs.aws.amazon.com/lambda/latest/dg/with-msk.html#services-msk-consumer-group-id"
       >Customizable consumer group ID</a>.
aws-java-sdk-lambda/src/main/java/com/amazonaws/services/lambda/model/AmazonManagedKafkaEventSourceConfig.java