Error:  API not found for aggr-data-reduction-storage-efficiency-ratio

• ONTAP 9.12 or lower
• REST API

• ONTAP 9.12 returns results

[root@centos /]# curl -k -u admin -X GET "https://x.x.x.x/api/private/cli/storage/aggregate/show-efficiency?return_timeout=15&aggregate=aggr1&fields=aggr-data-reduction-storage-efficiency-ratio" -H "accept: application/json"
Enter host password for user 'admin':
{
  "records": [
    {
      "aggregate": "aggr1",
      "aggr_data_reduction_storage_efficiency_ratio": "1.00:1"
    }
  ],
  "num_records": 1

• Running a curl for ONTAP 9.8 results in error:  API not found.

# curl -k -u admin -X GET "https://x.x.x.x/api/private/cli/storage/aggregate/show-efficiency?return_timeout=15&aggregate=aggr1&fields=aggr-data-reduction-storage-efficiency-ratio" -H "accept: application/json"
Enter host password for user 'admin':
{
  "error": {
    "message": "API not found",
    "code": "3"
  }