④. should:应该满足should所列举的条件。满足条件最好,不满足也可以,满足得分更高
(should:应该达到should列举的条件,如果到达会增加相关文档的评分,并不会改变查询的结果。如果query中只有should且只有一种匹配规则,那么should的条件就会被作为默认匹配条件二区改变查询结果)
实例:匹配lastName应该等于Wallace的数据 GET bank/_search { "query": { "bool": { "must": [ { "match": { "gender": "M" } }, { "match": { "address": "mill" } } ], "must_not": [ { "match": { "age": "18" } } ], "should": [ { "match": { "lastname": "Wallace" } } ] } } } 查询结果: { "took" : 5, "timed_out" : false, "_shards" : { "total" : 1, "successful" : 1, "skipped" : 0, "failed" : 0 }, "hits" : { "total" : { "value" : 3, "relation" : "eq" }, "max_score" : 12.585751, "hits" : [ { "_index" : "bank", "_type" : "account", "_id" : "970", "_score" : 12.585751, "_source" : { "account_number" : 970, "balance" : 19648, "firstname" : "Forbes", "lastname" : "Wallace", # 因为匹配了should,所以得分第一 "age" : 28, # 不是18 "gender" : "M", # "address" : "990 Mill Road", # "employer" : "Pheast", "email" : "forbeswallace@pheast.com", "city" : "Lopezo", "state" : "AK" } }, { "_index" : "bank", "_type" : "account", "_id" : "136", "_score" : 6.0824604, "_source" : { "account_number" : 136, "balance" : 45801, "firstname" : "Winnie", "lastname" : "Holland", "age" : 38, "gender" : "M", "address" : "198 Mill Lane", "employer" : "Neteria", "email" : "winnieholland@neteria.com", "city" : "Urie", "state" : "IL" } }, { "_index" : "bank", "_type" : "account", "_id" : "345", "_score" : 6.0824604, "_source" : { "account_number" : 345, "balance" : 9812, "firstname" : "Parker", "lastname" : "Hines", "age" : 38, "gender" : "M", "address" : "715 Mill Avenue", "employer" : "Baluba", "email" : "parkerhines@baluba.com", "city" : "Blackgum", "state" : "KY" } } ] } } 能够看到相关度越高,得分也越高。
⑤. query/filter:并不是所有的查询都需要产生分数,特别是哪些仅用于filtering过滤的文档。为了不计算分数,elasticsearch会自动检查场景并且优化查询的执行
GET bank/_search { "query": { "bool": { "must": [ { "match": { "address": "mill" } } ], "filter": { "range": { "balance": { "gte": "10000", "lte": "20000" } } } } } } { "took" : 1, "timed_out" : false, "_shards" : { "total" : 1, "successful" : 1, "skipped" : 0, "failed" : 0 }, "hits" : { "total" : { "value" : 213, "relation" : "eq" }, "max_score" : 0.0, "hits" : [ { "_index" : "bank", "_type" : "account", "_id" : "20", "_score" : 0.0, "_source" : { "account_number" : 20, "balance" : 16418, "firstname" : "Elinor", "lastname" : "Ratliff", "age" : 36, "gender" : "M", "address" : "282 Kings Place", "employer" : "Scentric", "email" : "elinorratliff@scentric.com", "city" : "Ribera", "state" : "WA" } }, { "_index" : "bank", "_type" : "account", "_id" : "37", "_score" : 0.0, "_source" : { "account_number" : 37, "balance" : 18612, "firstname" : "Mcgee", "lastname" : "Mooney", "age" : 39, "gender" : "M", "address" : "826 Fillmore Place", "employer" : "Reversus", "email" : "mcgeemooney@reversus.com", "city" : "Tooleville", "state" : "OK" } }, 省略。。。
