Elasticsearch:如何在字段中添加语言分析器?

我有一个法语单词索引。我想对索引属性应用一个分析器。假设我有一个 title 我想把它看作是“法国财产”。我试过这个(在基巴纳):

PUT thing/_mappings/thing
{
  "properties": {
    "title": {
      "type": "text",
      "analyzer": "french",
      "fields": {
        "keyword": {
          "type": "keyword",
          "ignore_above": 256
        }
      }
    }
  }
}

{
  "error": {
    "root_cause": [
      {
        "type": "illegal_argument_exception",
        "reason": "Mapper for [title] conflicts with existing mapping in other types:\n[mapper [title] has different [analyzer]]"
      }
    ],
    "type": "illegal_argument_exception",
    "reason": "Mapper for [title] conflicts with existing mapping in other types:\n[mapper [title] has different [analyzer]]"
  },
  "status": 400
}

我不明白为什么我会有这个错误。如果我显示映射( GET thing/_mappings

 // ...
    "title": {
      "type": "text",
      "fields": {
        "keyword": {
          "type": "keyword",
          "ignore_above": 256
        }
      }
    }
  }

我怎样才能考虑我的 法国财产? (来源: https://www.elastic.co/guide/en/elasticsearch/reference/current/analysis-lang-analyzer.html )