Use S3 bucket in kendra

Hello.

Do you have the IAM role used by Kendra index configured to allow the "logs:CreateLogGroup" policy?
Please try setting a sample IAM policy in the document below.
Please change "your-region" and "your-account-id" to match your AWS account.
https://docs.aws.amazon.com/kendra/latest/dg/iam-roles.html

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": "cloudwatch:PutMetricData",
            "Resource": "*",
            "Condition": {
                "StringEquals": {
                    "cloudwatch:namespace": "AWS/Kendra"
                }
            }
        },
        {
            "Effect": "Allow",
            "Action": "logs:DescribeLogGroups",
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": "logs:CreateLogGroup",
            "Resource": "arn:aws:logs:your-region:your-account-id:log-group:/aws/kendra/*"
        },
        {
            "Effect": "Allow",
            "Action": [
                "logs:DescribeLogStreams",
                "logs:CreateLogStream",
                "logs:PutLogEvents"
            ],
            "Resource": "arn:aws:logs:your-region:your-account-id:log-group:/aws/kendra/*:log-stream:*"
        }
    ]
}