{
  "seed": 82,
  "split": "train",
  "purpose": "development baseline; BEIR test reserved for later confirmation",
  "top_k": 100,
  "k_values": [
    1,
    10,
    100
  ],
  "language": "english",
  "number_of_shards": 1,
  "batch_size": 64,
  "es_version": "7.17.9",
  "model": "Elasticsearch built-in BM25",
  "model_revision": "ef48222227ee6b9e70e502f0f0daa52435ee634d",
  "tokenizer": "Elasticsearch 7.17.9 english analyzer",
  "prompt": null,
  "decoding": null,
  "bm25_defaults": {
    "k1": 1.2,
    "b": 0.75
  },
  "fields": [
    "title",
    "txt"
  ],
  "multi_match": "best_fields",
  "tie_breaker": 0.5,
  "rank_tie_policy": "score descending, doc ID string descending (trec_eval)",
  "selection_rule": "one frozen default configuration, no hyperparameter search",
  "query_limit": null
}