aws network elb not generating logs

Question

I am trying to configure access logs for AWS Network ELB following this doc https://docs.aws.amazon.com/elasticloadbalancing/latest/network/load-balancer-access-logs.html

I specified bucket name & prefix, then selected Create this location for me

Following bucket policy was auto generated for the bucket

{
    "Version": "2012-10-17",
    "Id": "AWSConsole-AccessLogs-Policy-xxxxxxxxxxxxx",
    "Statement": [
        {
            "Sid": "AWSConsoleStmt-xxxxxxxxxxxxx",
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn:aws:iam::xxxxxxxxxxxx:root"
            },
            "Action": "s3:PutObject",
            "Resource": "arn:aws:s3:::bucket_name/prefix/AWSLogs/123456789012/*"
        },
        {
            "Sid": "AWSLogDeliveryWrite",
            "Effect": "Allow",
            "Principal": {
                "Service": "delivery.logs.amazonaws.com"
            },
            "Action": "s3:PutObject",
            "Resource": "arn:aws:s3:::bucket_name/prefix/AWSLogs/123456789012/*",
            "Condition": {
                "StringEquals": {
                    "s3:x-amz-acl": "bucket-owner-full-control"
                }
            }
        },
        {
            "Sid": "AWSLogDeliveryAclCheck",
            "Effect": "Allow",
            "Principal": {
                "Service": "delivery.logs.amazonaws.com"
            },
            "Action": "s3:GetBucketAcl",
            "Resource": "arn:aws:s3:::bucket_name"
        }
    ]
}

Bucket is created, but under AWSLogs/xxxxxxxx there aren't any log files generated. Anything I am missing here ?

Answer 1

From : https://docs.aws.amazon.com/elasticloadbalancing/latest/network/load-balancer-access-logs.html

Access logs are created only if the load balancer has a TLS listener and they contain information only about TLS requests.