Es search summary

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There are two main ways to search ,URL Search and request body search , One is to write the search criteria in URL in , One is to write the request in the request body .

• URL Parameter condition search

  grammar ：GET /index/type/_search? Parameters 

Argument parsing ：

q： Use a field to query , for example q=book_name:book, It is based on book_name If there book To search .
sort： Use a field to sort , for example sort=cost:desc, It is based on cost Fields for descending order desc Sort .
other ：fileds,timeout,analyzer【 These parameters are left in the request body search 】
Without parameters , by “ Full search ”
Multiple parameters use && Splicing
Example ：

GET /douban/book/_search?q=book_summary:character
GET /douban/book/_search?q=book_author:Milan
GET /douban/book/_search?q=book_summary:a
GET /douban/book/_search?q=book_summary:a&&sort=book_pages:desc
GET /douban/book/_search?q=book_summary:a&&q=book_author:Milan

【 It is worth noting that , Please don't be right first text Sort data of type , This affects search , Just sort the integers 】

• Request body condition search

// Full search 
GET /index/type/_search
GET /douban/book/_search

// Full search 
GET /index/type/_search
{
    
  "query": {
    
    "match_all": {
    }
  }
}
GET /douban/book/_search
{
    
  "query": {
    
    "match_all": {
    }
  }
}

//  Query the data of the specified field （ Full text search , If the search value has more than one word , The result of matching only one word can also be found ）：
GET /index/type/_search
{
    
  "query": {
    
    "match": {
    
      " Field name ": " Search value "
    }
  }
}
GET /douban/book/_search
{
    
  "query": {
    
    "match": {
    
      "book_name": "A The"
    }
  }
}


//  Search multiple fields using the same search value ：
GET /index/type/_search
{
    
  "query": {
    
    "multi_match": {
    
      "query": " Search value ",
      "fields": [
        " Search for fields 1"," Search for fields 2"]
    }
  }
}
GET /douban/book/_search
{
    
  "query": {
    
    "multi_match": {
    
      "query": "A",
      "fields": [
        "book_name","book_summary"]
    }
  }
}

//  Phrase query ：【 Search value must match exactly , Does not split search values to search 】
GET /index/type/_search
{
    
  "query": {
    
    "match_phrase": {
    
      " Field ": " Search value "
    }
  }
}
GET /douban/book/_search
{
    
  "query": {
    
    "match_phrase": {
    
      "book_summary": "a character"
    }
  }
}

//  Field filtering , The results of the query show only the specified fields 
GET /product/book/_search
{
    
  "query": {
    
    " Query criteria "
  },
  "_source": [
    " Fields to display 1",
    " Fields to display 2"
    ]
}
GET /douban/book/_search
{
    
  "query": {
    
    "match": {
    
      "book_name": "Story"
    }
  },
  "_source": [
    "book_name",
    "book_id"
    ]
}

//  Highlight query ：【 Highlight according to the keywords of the query , The highlighted results will be displayed in the returned results and will be automatically displayed in the returned results highlight in , Keywords will be added <em> label 】
//  If you want to highlight multiple fields , Multi field search is also required 
GET /index/book/_search
{
    
  "query": {
    
    " Query criteria "
  },
  "highlight": {
    
    "fields": {
    
      " Highlighted field name 1": {
    }
    }
  }
}
GET /douban/book/_search
{
    
  "query": {
    
    "match": {
    
      "book_summary": "Story"
    }
  },
  "highlight": {
    
    "fields": {
    
      "book_summary":{
    }
    }
  }
}
GET /douban/book/_search
{
    
  "query": {
    
    "multi_match": {
    
      "query": "Story",
      "fields": [
        "book_name","book_summary"]
    }

  },
  "highlight": {
    
    "fields": {
    
      "book_summary":{
    },
      "book_name":{
    }
    }
  }
}

The above shows about full search 、 Single field value full text search 、 Multi field single search value full text search 、 Phrase search 、 Field filtering 、 Highlight the search code .

Because using different search values for multiple fields involves condition splicing , So let's talk about it alone .
Pre knowledge explanation ： For conditional splicing , stay SQL There is and,or,not, stay ElasticSearch Not quite the same. , Let's explain one by one ：

bool: It is used to indicate that the statement in it is a combination of multiple conditions , Used to wrap multiple conditions .
should: There can be multiple conditions , The query result must meet one or more of the query criteria .
must： Many of the conditions must be true
must_not： Many conditions in it must not be tenable

Example ：
// The title of the book must contain Story Of

GET /douban/book/_search
{
    
  "query": {
    
    "bool": {
    
      "must": [
        {
    
          "match":{
    
            "book_name":"Story"
          }
        }
      ]
    }
  }
}

//  The title must not contain Story Of 
GET /douban/book/_search
{
    
  "query": {
    
    "bool": {
    
      "must_not": [
        {
    
          "match":{
    
            "book_name":"Story"
          }
        }
      ]
    }
  }
}

//  The title must not contain Story, The title of the book contains Adventures or Immortality Of 
GET /douban/book/_search
{
    
  "query": {
    
    "bool": {
    
      "must_not": [
        {
    
          "match":{
    
            "book_name":"Story"
          }
        }
      ],
      "should": [
        {
    
          "match": {
    
            "book_name": "Adventures"
          }
        },
        {
    
          "match": {
    
            "book_name": "Immortality"
          }
        }
      ]
    }
  }
}


//  stay should、must、must_not Many conditions can be put in these 
GET /douban/book/_search
{
    
  "query": {
    
    "bool": {
    
      "must_not": [
        {
    
          "match":{
    
            "book_name":"Story"
          }
        },
        {
    
          "match": {
    
            "book_name": "Adventures"
          }
        }
      ]
    }
  }
}

//  If it's a single condition , You can also write , Omit []：
GET /douban/book/_search
{
    
  "query": {
    
    "bool": {
    
      "must_not": {
    
          "match":{
    
            "book_name":"Story"
          }
      }
    }
  }
}

//  You can also nest conditions , That is to say, another layer of nesting bool, But pay attention to logic , for example ：
//  Query out （ The title of the book has story） perhaps （ The title of the book has The And the author's name is David） Of , The second is whether it can be established or not .
GET /douban/book/_search
{
    
  "query": {
    
    "bool": {
    
      "should": [
        {
    
          "match": {
    
            "book_name": "Story"
          }
        },
        {
    
          "bool": {
    
            "must": [
              {
    
                "match": {
    
                  "book_name": "The"
                }
              },
              {
    
                "match": {
    
                  "book_author": "David"
                }
              }
            ]
          }
        }
      ]
    }
  }
}

Summary ：

It says URL Parameter condition search and request body condition search , About full search 、 Single field value full text search 、 Multi field single search value full text search 、 Phrase search 、 Field filtering 、 How to use highlight search , It's based on bool、should、must、must_not Multi criteria search for , The above knowledge has been able to achieve some basic search functions . But there is still some knowledge because it is more obscure , So I'll leave it to the next chapter , For example, assign a word breaker to a search 、 Specify the number of matches for multiple conditions 、 Scrolling queries and so on .

It says URL Parameter condition search and request body condition search .URL The parameter conditions are written in URL Inside , use ? To attach parameters ,q Used to specify search fields . The request body parameter writes the condition in the request body ,query It's the outermost package ,match_all Used to query all ,match Used to search a field using a specified search value ,match_phrase Used to search for successive searches ,_source Used to filter fields （ And query At the same level ,[] Inside is the field name ）,highlight Used to highlight search （ And query At the same level , Inside is {field:{ Field name 1:{}, Field name 2:{}}}）,bool、should、must、must_not Used for multi criteria search .