IAM role for an Amazon Kendra retriever

When you use an Amazon Kendra index as a retriever, you must provide Amazon Q Business with an IAM role with permissions to access Amazon Kendra. You must also provide a trust policy that allows Amazon Q to assume the role. The following are the policies that must be provided.

To allow Amazon Q to access your Amazon Kendra index, use the following policy:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "KendraRetrieveAccess",
            "Effect": "Allow",
            "Action": [
                "kendra:Retrieve",
                "kendra:DescribeIndex"

            ],
            "Resource": "arn:aws:kendra:{{region}}:{{source_account}}:index/{{indexId}}"
        }
    ]
}

To allow Amazon Q to assume a role, use the following trust policy:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "AmazonQKendraAccessPermission",
      "Effect": "Allow",
      "Principal": {
        "Service": "qbusiness.amazonaws.com"
      },
      "Action": "sts:AssumeRole",
      "Condition": {
        "StringEquals": {
          "aws:SourceAccount": "{{source_account}}"
        },
      "ArnEquals": {
        "aws:SourceArn":"arn:aws:qbusiness:{{region}}:{{source_account}}:application/{{applicationId}}"
      }
      }
    }
  ]
}