But in my hits I am not getting any highlighting, e.g. hit.

{
  "document": {
    "content": [
      "CONTENT REMOVED AS PRIVATE"
    ],
    "document": [
      "disruption_toolkit_1_an_overview.html"
    ],
    "document_id": 1,
    "id": "28"
  },
  "highlight": {},
  "highlights": [],
  "hybrid_search_info": {
    "rank_fusion_score": 0.7074999809265137
  },
  "text_match": 1060320051,
  "text_match_info": {
    "best_field_score": "517734",
    "best_field_weight": 102,
    "fields_matched": 3,
    "num_tokens_dropped": 2,
    "score": "1060320051",
    "tokens_matched": 0,
    "typo_prefix_score": 255
  },
  "vector_distance": 0.6236110329627991
}