opensearch serverless - access denied 403 response problem

Hi, I tried the following template https://docs.aws.amazon.com/opensearch-service/latest/developerguide/serverless-cfn.html for opensearch serverless cloudformation. I changed the type to "SEARCH". when try to ingest data & search any query in collection it gives access denied 403 response. Do I need to add any policy?

this is the response I got

statusCode: 403, headers: { 'x-request-id': '2a496830-0989-9fad-b494-93ffe0ae597b', 'x-aoss-response-hint': 'X01:gw-helper-deny', 'content-type': 'application/json', date: 'Fri, 03 Feb 2023 06:47:29 GMT', 'content-length': '236', server: 'aoss-amazon' }