Elasticsearch索引字段类型简介
herefree
2019年11月27日
更多设置 官网
字段类型设置
Index - 控制当前字段是否被索引。默认为 true。如果设置成 flase, 该字段不可被搜索。
DELETE users
PUT users
{
"mappings" : {
"properties" : {
"firstName" : {
"type" : "text"
},
"lastName" : {
"type" : "text"
},
"mobile" : {
"type" : "text",
"index": false
}
}
}
}null_value
- 需要对 Null 值实现搜索
- 只有 Keyword 类型支持设定 Null_Value
PUT users
{
"mappings" : {
"properties" : {
"firstName" : {
"type" : "text"
},
"lastName" : {
"type" : "text"
},
"mobile" : {
"type" : "keyword",
"null_value": "NULL"
}
}
}
}copy_to
- copy_to 将字段的数值拷贝到目标字段
- copy_to 的目标字段不出现在_source 中
PUT users
{
"mappings": {
"properties": {
"firstName":{
"type": "text",
"copy_to": "fullName"
},
"lastName":{
"type": "text",
"copy_to": "fullName"
}
}
}
}
PUT users/_doc/1
{
"firstName":"Ruan",
"lastName": "Yiming"
}
GET users/_search?q=fullName:(Ruan Yiming)
POST users/_search
{
"query": {
"match": {
"fullName":{
"query": "Ruan Yiming",
"operator": "and"
}
}
}
}数组类型
- Elasticsearch 中不提供专门的数组类型。但是任何字段，都可以包含多个相同类类型的数值。
PUT users/_doc/1
{
"name":"onebird",
"interests":"reading"
}
PUT users/_doc/1
{
"name":"twobirds",
"interests":["reading","music"]
}多字段类型
多字段特性
- 精确匹配：默认给每个 text 字段添加 keyword 字段
- 使用不同的 analyzer
- 不同语言
- pinyin 字段搜索
- 支持为搜索和索引指定不同的 analyzer
Exact Values v.s Full Text
- Exact Value: 包括数字 / 日期 / 具体一个字符串（例如“Apple store”）
- Elasticsearch 中的 keyword
- 全文本，非结构话的文本数据
- ELasticsearch 中的 text
Exact Value 在索引时不需要被分词
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