If the domain was created inside a VPC, the names of the availability zones the configured subnet_ids were created inside.
subnet_ids
List of VPC Security Group IDs to be applied to the OpenSearch domain endpoints. If omitted, the default Security Group for the VPC will be used.
List of VPC Subnet IDs for the OpenSearch domain endpoints to be created in.
If the domain was created inside a VPC, the ID of the VPC.