ElasticSearch5.6.3中mapping字段的分词问题?报错

大家好，我用ElasticSearch5.6.3和对应的java api，在做聚合的时候，需要先对聚合字段做映射，也就是mapping。字段类型是string类型的，聚合的结果中，会把聚合字段分词。我想要的结果是聚合字段不分词。

TransportClient client=getClient();  
		    	PutMappingRequestBuilder putMapping = client.admin().indices().preparePutMapping("alert")   
		        .setType("loginInfo");    
		    	putMapping.setUpdateAllTypes(true);
		    	putMapping.setSource("{\"properties\":{\"Application_System\":{\"type\":\"string\",\"fielddata\":true}}}")
		        .get();

此时得到的分组结果是：

Application_System=务,MAX(Login_Time)=1.51153794E12,
Application_System=台,MAX(Login_Time)=1.51153794E12,
Application_System=商,MAX(Login_Time)=1.51153794E12,
Application_System=子,MAX(Login_Time)=1.51153794E12,
Application_System=平,MAX(Login_Time)=1.51153794E12,
Application_System=电,MAX(Login_Time)=1.51153794E12,

实际上，我需要的结果是一行数据：

Application_System=电子商务平台,MAX(Login_Time)=1.51153794E12,

查看官网的文档说明，说是添加index:not_analyzed可以让字段不分词，于是修改mapping映射如下：

putMapping.setSource("{\"properties\":{\"Application_System\":{\"type\":\"string\",\"fielddata\":true,\"index\":\"not_analyzed\"}}}")
		        .get();

运行会报错：

MapperParsingException[Mapping definition for [Application_System] has unsupported parameters:  [fielddata : true]]
	at org.elasticsearch.index.mapper.DocumentMapperParser.checkNoRemainingFields(DocumentMapperParser.java:151)
	at org.elasticsearch.index.mapper.DocumentMapperParser.checkNoRemainingFields(DocumentMapperParser.java:145)
	at org.elasticsearch.index.mapper.ObjectMapper$TypeParser.parseProperties(ObjectMapper.java:285)
	at org.elasticsearch.index.mapper.ObjectMapper$TypeParser.parseObjectOrDocumentTypeProperties(ObjectMapper.java:199)
	at org.elasticsearch.index.mapper.RootObjectMapper$TypeParser.parse(RootObjectMapper.java:102)
	at org.elasticsearch.index.mapper.DocumentMapperParser.parse(DocumentMapperParser.java:111)
	at org.elasticsearch.index.mapper.DocumentMapperParser.parse(DocumentMapperParser.java:91)
	at org.elasticsearch.index.mapper.MapperService.parse(MapperService.java:644)
	at org.elasticsearch.cluster.metadata.MetaDataMappingService$PutMappingExecutor.applyRequest(MetaDataMappingService.java:264)
	at org.elasticsearch.cluster.metadata.MetaDataMappingService$PutMappingExecutor.execute(MetaDataMappingService.java:230)
	at org.elasticsearch.cluster.service.ClusterService.executeTasks(ClusterService.java:634)
	at org.elasticsearch.cluster.service.ClusterService.calculateTaskOutputs(ClusterService.java:612)
	at org.elasticsearch.cluster.service.ClusterService.runTasks(ClusterService.java:571)
	

在此请教大家，想让聚合字段不分词，该如何处理？