#註意 以下字段 均默認text類型   
# match查詢
GET article2/info/_search
{
  "query":{
    "match":{
      "title":"MySQL-MMM"
    }
  },
  "from": 0,
  "size": 3
}


# term查詢 （屬於精確查找） 
GET article2/info/_search
{
  "query":{
    "term": {
      "title":"MySQL-MMM"
    }
  }
}


# terms查詢 #滿足一個詞就能查詢出來
GET article2/info/
 
_search
{
  "query":{
    "terms":{
      "title":["linux", "振興"]
    }
  }
}


# match_all查詢
GET article2/info/_search
{
  "query":{
    "match_all":{}
  },
  "from": 1,
  "size": 2
}



# match_phrase查詢 #可以設置關鍵詞之間距離大於幾  
GET article2/info/_search
{
  "query":{
    "match_phrase": {
      "title": {
        "query"
 
:"mysql集群",
        "slop": 2
      }
    }
  }
}


# multi_match查詢
GET article2/info/_search
{
  "query":{
    "multi_match": {
      "query": "mysql",
      "fields": ["title^3","content"]
    }
  }
}


# 指定返回字段
GET article2/info/_search
{
  "stored_fields": ["content"],
  "query":{
    "match": {
      "title"
 
: "mysql"
    }
  }
}


# sort排序
GET article2/info/_search
{
  "query":{
    "match": {
      "title": "mysql"
    }
  },
  "sort": [{
      "_score": {
        "order": "desc"
      }
  }]
}




# 範圍查詢 
GET article2/info/_search
{
  "query":{
    "range":{
      "publish_date": {
          "gte":"2018/05/18",
          "lte":"now",
          "boost":1.0
      }
    }
  }
}


# wildcard查詢
GET article2/info/_search
{
  "query":{
    "wildcard": {
      "title": {
        "value": "pyth*n",
        "boost": 2
      }
    }
  }
}


# bool查詢  filtered被替換
# bool包括must,should,must_not,filter 4種
# bool:{
#   "must":[],  
#   "should":[],
#   "must_not":[],
#   "filter":[],
# }


# 添加模擬數據
POST test2/info/_bulk
{"index":{"_id":1}}
{"salary":100, "title":"Python"}
{"index":{"_id":2}}
{"salary":80, "title":"mysql"}
{"index":{"_id":3}}
{"salary":40, "title":"linux"}
{"index":{"_id":4}}
{"salary":90, "title":"java"}
{"index":{"_id":5}}
{"salary":50, "title":"ruby"}

# 最簡單的filter查詢 不參與打分 
# select * from info where salary=100;
GET test2/info/_search
{ 
  "query":{
    "bool":{
      "must":[
        {
          "match_all":{}
        }
      ],
      "filter":[
        {
          "term":{
            "salary":100
          }
        }  
      ]
    }
  }
}

# select * from info where title=Python;
GET test2/info/_search
{ 
  "query":{
    "bool":{
      "must":[
        {
          "match_all":{}
        }
      ],
      "filter":[
        {
          "term":{
            "title":"python"
          }
        }  
      ]
    }
  }
}
# 用term無結果，因為大寫分詞時會成小寫，精確查找（filter）是找不到
# 要麽換成match, 要麽改成小寫python

# 查看分詞器
GET _analyze
{
  "analyzer": "ik_max_word",
  "text": "Python網絡"
}
# 論證 大寫分詞時會成小寫






# bool的組合過濾查詢
# select * from info where (salary=70 OR title=Python) AND (salary!=30)
GET test2/info/_search
{
  "query":{
    "bool":{
      "should":[
        {
          "term":{
            "salary":70
          }
        },
        {
          "term":{
            "title":"python"
          }
        }
      ],
      "must_not":[
        {
          "term":{
            "salary":30
          }
        }  
      ]
    }
  }
}


# 為空和不為空查詢 
# 模擬數據 
POST test2/info2/_bulk
{"index":{"_id":1}}
{"tags":"lily"}
{"index":{"_id":2}}
{"tags":"jack"}
{"index":{"_id":3}}
{"tags":null}
{"index":{"_id":4}}
{"tags":"lucy"}
{"index":{"_id":5}}
{"tags":null}
{"index":{"_id":6}}
{"tags":"queen"}


# 查詢不為空的tags 
GET test2/info2/_search
{
  "query":{
    "bool":{
      "must": [
        {
          "exists":{
            "field":"tags"
          }
        }
      ]
    }
  } 
}


# 查詢空tags(不查詢存在的tags ) 
GET test2/info2/_search
{
  "query":{
    "bool":{
      "must_not": [
        {
          "exists":{
            "field":"tags"
          }
        }
      ]
    }
  } 
}

elasticsearch查詢