（15）ElasticSearch Filter查询

Posted 2022-09-29 javasl

filter是不计算相关性的，同时可以cache，因此，filter速度要快于query

1、准备数据

POST /lib7/items/_bulk
"index":"_id":1
"price":40,"itemID":"ID100123"
"index":"_id":2
"price":50,"itemID":"ID100124"
"index":"_id":3
"price":25,"itemID":"ID100125"
"index":"_id":4
"price":30,"itemID":"ID100126"
"index":"_id":5
"price":null,"itemID":"ID100127"

2、查询price是40的；查询price是25或者40的

GET /lib7/items/_search

    "query":
        "bool":
            "filter":[
                "term":"price":40
            ]
        
    


GET /lib7/items/_search

    "query":
        "bool":
            "filter":[
                "terms":"price":[25,40]
            ]
        
    

3、查询itemID是ID100123的，用第一种方式查询不出来，因为创建时itemID的mapping类型默认是text，存储时分词，存储的是id100123。默认小写。

#查询不出
GET /lib7/items/_search

    "query":
        "bool":
            "filter":[
                "term":"itemID":"ID100123"
            ]
        
    


#能查询出
GET /lib7/items/_search

    "query":
        "bool":
            "filter":[
                "term":"itemID":"id100123"
            ]
        
    

　　或者自定义mapping，改为不分词的：

#查看mapping
GET /lib7/_mapping

#删除mapping
DELETE  lib7

#重新创建mapping
PUT /lib7

    "mappings":
        "items":
            "properties":
                "itemID":
                    "type":"text",
                    "index":false
                
            
        
    

4、bool过滤查询。可以实现组合过滤查询，格式如下 ：

　　"bool":"must":[],"should":[],"must_not":[]

　　must:必须满足的条件---and

　　should：可以满足也可以不满足的条件---or

　　must_not:不需要满足的条件-----not

（4.1）查询price是25或者itemID是id100123的 并且 price不能是30

GET /lib7/items/_search

    "post_filter":
        "bool":
            "should":[
                "term":"price":25,
                "term":"itemID":"id100123"
            ],
            "must_not":
                "term":"price":30
            
        
    


#或者
GET /lib7/items/_search

    "query":
        "bool":
            "should":[
                "term":"price":25,
                "term":"itemID":"id100123"
            ],
            "must_not":
                "term":"price":30
            
        
    

（4.2）嵌套使用bool：要么id100123，要么（id是100124价格是40）并且价格 不能是30

GET /lib7/items/_search

    "post_filter":
        "bool":
            "should":[
                "term":"itemID":"id100123",
                "bool":"must":[
                    "term":"itemID":"id100124",
                    "term":"price":40
                ]
            ],
            "must_not":
                "term":"price":30
            
        
    

5、范围过滤。gt:>；lt:<；gte:>=；lte:<=

（5.1）price价格大于25且小于50的

GET /lib7/items/_search

    "post_filter":
        "range":
            "price":
                "gt":25,"lt":50
            
        
    

（5.2）查询价格不是null的

GET /lib7/items/_search

    "query":
        "bool":
            "filter":
                "exists":
                    "field":"price"