PUT _inference/text_embedding/mistral-text_embedding
{
  "service": "mistral",
  "service_settings": {
        "model": "mistral-embed",
        "dimensions": 1024,
        "similarity": "dot_product",
        "rate_limit": {
            "requests_per_minute": 240
        },
        "api_key": "API_KEY"
    },
    "chunking_settings": {
        "strategy": "sentence",
        "max_chunk_size": 250,
        "sentence_overlap": 1
    }
}

PUT my-index
{
  "mappings": {
    "properties": {
      "keyword_field": {
        "type": "keyword"
      },
      "inference_field": {
        "type": "semantic_text",
        "inference_id": "mistral-text_embedding"
      }
    }
  }
}

POST my-index/_search
{
  "query": {
    "semantic": {
      "field": "inference_field",
      "query": "What is Elasticsearch?"
    }
  },
  "fields": ["_inference_fields"],
  "highlight": {
    "fields": {
      "inference_field": {} -- tried with `type=semantic` as well
    }
  }
}