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

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