curl --request POST \
  --url http://localhost:5300/api/v1/knowledge/bases/{kb_uuid}/files \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "file_id": "document_abc123.pdf"
}
'

{
  "code": 0,
  "msg": "ok",
  "data": {
    "task_id": "<string>"
  }
}