Request:

POST /api/environments/
Accept: application/json
Authorization: NIRMATA-API <key>

{
  "name": "dev-test",
  "hostCluster": {"name" : "devtest-aks-us-east"}
}

Note the different ways you can specify a relation in the JSON. For a 1-1 relationship you can:

1. Specify an UUID
2. Specify a JSON object with fields that can be used to find the relation. In the example above, we use the name field to query the Cluster.