Elasticsearch 实战Query DSL搜索语法
Elasticsearch实战
本课时主要介绍以下三种语法
must 必须满足；
should 如果包含了must或者filter查询，那么should的查询语句就不是或者的意思了,而是有或者没有都行的含义；使用minimum_should_match，至少匹配一项should子句；
must_not 必须不满足；
step1
准备三条介绍技术的文档
POST /technology/type/_bulk
{"index":{"_id":1}}
{"title":"ES搜索引擎","content":"Elasticsearch是一个基于Lucene的搜索服务器。","creator":"Lucene","cost":60}
{"index":{"_id":2}}
{"title":"Solr搜索引擎","content":"Solr是一个高性能，采用Java开发，基于Lucene的全文搜索服务器","creator":"Lucene","cost":20}
{"index":{"_id":3}}
{"title":"RocketMQ","content":"消息队列 RocketMQ 版（原ONS）是阿里云基于 Apache RocketMQ构建的低延迟、高并发、高可用、高可靠的分布式消息中间件。","creator":"Alibaba","cost":30}
step2
需求查询‘’搜索引擎“，内容可以包含“消息队列”也可以不包含，不可以来自Alibaba
GET /technology/type/_search
{"query": {"bool": {"must": [{"match": {"title": "搜索引擎"}}],"should": [{"match": {"content": "消息队列"}}],"must_not": [{"match": {"creator": "Alibaba"}}]}}
}#! Deprecation: [types removal] Specifying types in search requests is deprecated.
{
"took" : 530,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 2,
"relation" : "eq"
},
"max_score" : 1.6365592,
"hits" : [
{
"_index" : "technology",
"_type" : "type",
"_id" : "1",
"_score" : 1.6365592,
"_source" : {
"title" : "ES搜索引擎",
"content" : "Elasticsearch是一个基于Lucene的搜索服务器。",
"creator" : "Lucene",
"cost" : 60
}
},
{
"_index" : "technology",
"_type" : "type",
"_id" : "2",
"_score" : 1.6365592,
"_source" : {
"title" : "Solr搜索引擎",
"content" : "Solr是一个高性能，采用Java开发，基于Lucene的全文搜索服务器",
"creator" : "Lucene",
"cost" : 20
}
}
]
}
}
step3
使用"minimum_should_match": 1
GET /technology/type/_search
{"query": {"bool": {"must": [{"match": {"title": "搜索引擎"}}],"should": [{"match": {"content": "消息队列"}}],"must_not": [{"match": {"creator": "Alibaba"}}],"minimum_should_match": 1}}
}#! Deprecation: [types removal] Specifying types in search requests is deprecated.
{
"took" : 0,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 0,
"relation" : "eq"
},
"max_score" : null,
"hits" : [ ]
}
}
step4
没有must或者filter查询表示或
GET /technology/type/_search
{"query": {"bool": {"should": [{"match": {"creator": "Lucene"}},{"match": {"title": "RocketMQ"}}]}}
}#! Deprecation: [types removal] Specifying types in search requests is deprecated.
{
"took" : 0,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 3,
"relation" : "eq"
},
"max_score" : 1.3962393,
"hits" : [
{
"_index" : "technology",
"_type" : "type",
"_id" : "3",
"_score" : 1.3962393,
"_source" : {
"title" : "RocketMQ",
"content" : "消息队列 RocketMQ 版（原ONS）是阿里云基于 Apache RocketMQ构建的低延迟、高并发、高可用、高可靠的分布式消息中间件。",
"creator" : "Alibaba",
"cost" : 30
}
},
{
"_index" : "technology",
"_type" : "type",
"_id" : "1",
"_score" : 0.4700036,
"_source" : {
"title" : "ES搜索引擎",
"content" : "Elasticsearch是一个基于Lucene的搜索服务器。",
"creator" : "Lucene",
"cost" : 60
}
},
{
"_index" : "technology",
"_type" : "type",
"_id" : "2",
"_score" : 0.4700036,
"_source" : {
"title" : "Solr搜索引擎",
"content" : "Solr是一个高性能，采用Java开发，基于Lucene的全文搜索服务器",
"creator" : "Lucene",
"cost" : 20
}
}
]
}
}
step5
GET /technology/type/_search
{"query": {"bool": {"should": [{"match": {"creator": "Lucene"}},{"match": {"title": "RocketMQ"}}],"minimum_should_match": 2}}
}#! Deprecation: [types removal] Specifying types in search requests is deprecated.
{
"took" : 0,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 0,
"relation" : "eq"
},
"max_score" : null,
"hits" : [ ]
}
}
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