EKS Audit Log Collected by Security Lake Not Loaded

[yusukex2]

Is EKS audit log collected by Security Lake supported atm?
https://aws.amazon.com/about-aws/whats-new/2024/02/amazon-security-lake-audit-logs-eks/

I am trying to load EKS audit log from Security Lake S3 bucket to OpenSearch.
es-loader gets invoked. However, the log is not loaded to OpenSearch with the following messages.

/var/task/aws_lambda_powertools/metrics/provider/base.py:208: UserWarning: No application metrics to publish. The cold-start metric may be published if enabled. If application metrics should never be empty, consider using 'raise_on_empty_metrics'

self.flush_metrics(raise_on_empty_metrics=raise_on_empty_metrics)

[yusukex2]

Does anyone know how to load EKS audit logs to OpenSearch?
Can we use aes-es-loader Lambda function?