技術標籤：Elasticsearch實戰elasticsearch

Elasticsearch實戰

本課時主要介紹以下三種語法

must 必須滿足；

should如果包含了must或者filter查詢，那麼should的查詢語句就不是或者的意思了,而是有或者沒有都行的含義；使用minimum_should_match，至少匹配一項should子句；

must_not 必須不滿足；

step1

準備三條介紹技術的文件

POST /technology/type/_bulk
{"index":{"_id":1}}
{"title":"ES搜尋引擎","content":"Elasticsearch是一個基於Lucene的搜尋伺服器。","creator":"Lucene","cost":60}
{"index":{"_id":2}}
{"title":"Solr搜尋引擎","content":"Solr是一個高效能，採用Java開發，基於Lucene的全文搜尋伺服器","creator":"Lucene","cost":20}
{"index":{"_id":3}}
{"title":"RocketMQ","content":"訊息佇列 RocketMQ 版（原ONS）是阿里雲基於 Apache RocketMQ構建的低延遲、高併發、高可用、高可靠的分散式訊息中介軟體。","creator":"Alibaba","cost":30}
 

step2

需求查詢‘’搜尋引擎“，內容可以包含“訊息佇列”也可以不包含，不可以來自Alibaba

GET /technology/type/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "match": {
            "title": "搜尋引擎"
          }
        }
      ],
      "should": [
        {
          "match": {
            "content": "訊息佇列"
          }
        }
      ],
      "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搜尋引擎",
"content" : "Elasticsearch是一個基於Lucene的搜尋伺服器。",
"creator" : "Lucene",
"cost" : 60
}
},
{
"_index" : "technology",
"_type" : "type",
"_id" : "2",
"_score" : 1.6365592,
"_source" : {
"title" : "Solr搜尋引擎",
"content" : "Solr是一個高效能，採用Java開發，基於Lucene的全文搜尋伺服器",
"creator" : "Lucene",
"cost" : 20
}
}
]
}
}

step3

使用"minimum_should_match": 1

GET /technology/type/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "match": {
            "title": "搜尋引擎"
          }
        }
      ],
      "should": [
        {
          "match": {
            "content": "訊息佇列"
          }
        }
      ],
      "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

沒有must或者filter查詢表示或

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" : "訊息佇列 RocketMQ 版（原ONS）是阿里雲基於 Apache RocketMQ構建的低延遲、高併發、高可用、高可靠的分散式訊息中介軟體。",
"creator" : "Alibaba",
"cost" : 30
}
},
{
"_index" : "technology",
"_type" : "type",
"_id" : "1",
"_score" : 0.4700036,
"_source" : {
"title" : "ES搜尋引擎",
"content" : "Elasticsearch是一個基於Lucene的搜尋伺服器。",
"creator" : "Lucene",
"cost" : 60
}
},
{
"_index" : "technology",
"_type" : "type",
"_id" : "2",
"_score" : 0.4700036,
"_source" : {
"title" : "Solr搜尋引擎",
"content" : "Solr是一個高效能，採用Java開發，基於Lucene的全文搜尋伺服器",
"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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