reason": "Root mapping definition has unsupported parameters:

1、在Kibana創建索引的時候報錯，使用的elasticsearch版本是7.2.1版本。

PUT /person
{
  "settings": {
    "number_of_shards": "10",
    "number_of_replicas": "0",
    "refresh_interval": "-1"
  },
  "mappings": {
    "properties": {
      "update_time": {
        "format": "yyyy-MM-dd HH:mm:ss",
        "type": "date"
      },
      "username": {
        "type": "keyword"
      },
      "address": {
        "type": "keyword"
      }
    }
  }
}

　　報錯，如下所示：

{
    "error": {
        "root_cause": [{
            "type": "mapper_parsing_exception",
            "reason": "Root mapping definition has unsupported parameters:  [project_evaluate : {properties={update_time={format=yyyy-MM-dd HH:mm:ss, type=date}, username={type=keyword}, address={type=keyword}}}]"
        }],
        "type": "mapper_parsing_exception",
        "reason": "Failed to parse mapping [_doc]: Root mapping definition has unsupported parameters:  [project_evaluate : {properties={update_time={format=yyyy-MM-dd HH:mm:ss, type=date}, username={type=keyword}, address={type=keyword}}}]",
        "caused_by": {
            "type": "mapper_parsing_exception",
            "reason": "Root mapping definition has unsupported parameters:  [project_evaluate : {properties={update_time={format=yyyy-MM-dd HH:mm:ss, type=date}, username={type=keyword}, address={type=keyword}}}]"
        }
    },
    "status": 400
}

　　具體原因是ElasticSearch 7.x 默認不在支持指定索引類型。所以在ElasticSearch 7.x中不指定索引類型，創建索引是成功的。

　　但是對於ElasticSearch 6.x執行時沒有問題的，Elasticsearch7默認不在支持指定索引類型，默認索引類型是_doc，索引不再推薦創建索引類型了，使用默認的即可。因為elasticsearch8后就不在提供該字段。