curl --request GET \
  --url https://api.clovastudio.go.kr/v1/rag42/collections/{collection_id}/documents/{document_id} \
  --header 'Authorization: Bearer <token>'

{
  "status": {
    "code": "20000",
    "message": "OK"
  },
  "result": {
    "document_id": "ed5754eec78e4e0783ce075549ccadaa",
    "document_name": "2024년_업무추진계획.pdf",
    "file_name": "2024년_업무추진계획.pdf",
    "file_size": 2458624,
    "file_extension": "pdf",
    "search_status": "ACTIVE",
    "upload_status": "SUCCESS",
    "processing_status": "COMPLETED",
    "chunk_count": 15,
    "created_at": "2024-10-18T12:00:00Z",
    "updated_at": "2024-10-18T12:00:00Z",
    "external_id": "DOC-2024-001"
  }
}