Fielddata is disabled on text fields by default. Set fielddata=true

在ES5.X之后，默认的text类型无法做聚合操作。 比如官方的例子：
 

{	"size":0,

	"aggs":

	{

		"color":

		{

		"terms":{

			"field":"color"

		}

		}

	}

}

创建数据如下：
 

curl -X POST "10.18.6.102:9200/cars/transactions/_bulk" -H 'Content-Type: application/json' -d'

{ "index": {}}

{ "price" : 10000, "color" : "red", "make" : "honda", "sold" : "2014-10-28" }

{ "index": {}}

{ "price" : 20000, "color" : "red", "make" : "honda", "sold" : "2014-11-05" }

{ "index": {}}

{ "price" : 30000, "color" : "green", "make" : "ford", "sold" : "2014-05-18" }

{ "index": {}}

{ "price" : 15000, "color" : "blue", "make" : "toyota", "sold" : "2014-07-02" }

{ "index": {}}

{ "price" : 12000, "color" : "green", "make" : "toyota", "sold" : "2014-08-19" }

{ "index": {}}

{ "price" : 20000, "color" : "red", "make" : "honda", "sold" : "2014-11-05" }

{ "index": {}}

{ "price" : 80000, "color" : "red", "make" : "bmw", "sold" : "2014-01-01" }

{ "index": {}}

{ "price" : 25000, "color" : "blue", "make" : "ford", "sold" : "2014-02-12" }

'

那么运行聚合操作会报错，官方的说法是text是会分词，如果text中一个文本为New York，那么就会被分成2个桶，一个New桶，一个York桶，那么显然不能聚合操作，要么你把该类型替换成keyword类型，因为keyword类型是不会分词的，可以用来做聚合操作。
 
如果实在是想要用text做聚合操作，那么可以手工修改其mapping
 

PUT my_index/_mapping/_doc

{

  "properties": {

    "my_field": { 

      "type":     "text",

      "fielddata": true

    }

  }

}

上面语句可以在已有d的mapping上修改。
 
修改完成后就可以正常聚合操作了。