curl --request POST \
  --url https://api.mixpeek.com/v1/retrievers/{retriever_id}/evaluations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "dataset_name": "<string>",
  "evaluation_config": {
    "k_values": [
      1,
      5,
      10,
      20
    ],
    "metrics": [
      "precision",
      "recall",
      "f1",
      "map",
      "ndcg",
      "mrr"
    ]
  }
}
'

{
  "task_id": "<string>",
  "evaluation_id": "<string>",
  "created_at": "<string>",
  "task_type": "retriever.evaluation",
  "status": "pending"
}