add missing service to auth instantiation

src/pds/registrysweepers/utils/db/client.py

@@ -65,7 +65,7 @@ def get_aws_credentials_from_ssm(iam_role_name: str) -> Credentials:
     url = f"http://169.254.169.254/latest/meta-data/iam/security-credentials/{iam_role_name}"
     response = requests.get(url)
     if response.status_code != 200:
-        raise RuntimeError(f'Got HTTP{response.status_code} when attempting to retrieve SSM credentials from {url}')
+        raise RuntimeError(f"Got HTTP{response.status_code} when attempting to retrieve SSM credentials from {url}")
     content = response.json()
 
     access_key_id = content["AccessKeyId"]
@@ -79,7 +79,7 @@ def get_aws_credentials_from_ssm(iam_role_name: str) -> Credentials:
 def get_aws_aoss_client_from_ssm(endpoint_url: str, iam_role_name: str) -> OpenSearch:
     # https://opensearch.org/blog/aws-sigv4-support-for-clients/
     credentials = get_aws_credentials_from_ssm(iam_role_name)
-    auth = RequestsAWSV4SignerAuth(credentials, "us-west-2")
+    auth = RequestsAWSV4SignerAuth(credentials, "us-west-2", "aoss")
     return get_aws_opensearch_client(endpoint_url, auth)