index.json

{
  "settings": {
    "index": {
      "number_of_shards": 3,
      "number_of_replicas": 2,
      "analysis": {
        "analyzer": {
          "keyword_lowercase": {
            "tokenizer": "keyword",
            "filter": [
              "lowercase"
            ]
          }
        }
      }
    }
  },
  "mappings": {
    "content": {
      "_all": {
        "enabled": false
      },
      "properties": {
        "author_name": {
          "type": "string",
          "analyzer": "keyword_lowercase"
        }
      }
    }
  }
}