Returns information about a configured OpenSearch Serverless security policy. For more information, see <a href="https://docs.aws.amazon.com/opensearch-service/latest/developerguide/serverless-network.html">Network access for Amazon OpenSearch Serverless</a> and <a href="https://docs.aws.amazon.com/opensearch-service/latest/developerguide/serverless-encryption.html">Encryption at rest for Amazon OpenSearch Serverless</a>.