curl --request GET \
  --url https://api.example.com/v1/voiceai/knowledge-base/{document_id}/rag-index \
  --header 'x-api-key: <api-key>'

{
  "indexes": [
    {
      "id": "<string>",
      "model": "e5_mistral_7b_instruct",
      "status": "created",
      "progress_percentage": 123,
      "document_model_index_usage": {
        "used_bytes": 123
      }
    }
  ]
}