Elasticsearch 6.x Learning notes: 30. Full-text query __java Java API

1, full-text query overview

Https://www.elastic.co/guide/en/elasticsearch/client/java-api/6.1/java-full-text-queries.html

The high-level full text queries are usually used to running full text queries on full text fields like the ' body of ' an EM Ail. They understand how the field being queried are analyzed and would apply each field ' analyzer (or Search_analyzer) to the Q Uery string before executing. 1.1 Match Query

The standard query for performing full text queries, including fuzzy matching and phrase or proximity queries.

QueryBuilder query=querybuilders.matchquery (
        "name"),                                              
        

1.2 multi_match Query

The Multi-field version of the match query.

QueryBuilder query=querybuilders.multimatchquery (
        "Kimchy elasticsearch",                              
        "user", "message");

1.3 common_terms Query

A more specialized query which gives more preference to uncommon words.

QueryBuilder query=querybuilders.commontermsquery ("name", "Kimchy");  

1.4 query_string Query

Supports the Compact Lucene query string syntax, allowing to specify and|or| Not conditions and Multi-field search within a single query string. For expert users.

QueryBuilder query=querybuilders.querystringquery ("+kimchy-elasticsearch");

1.5 simple_query_string

A simpler, more robust version of the QUERY_STRING syntax suitable for exposing to users.

QueryBuilder query=querybuilders.simplequerystringquery ("+kimchy-elasticsearch");

2. Example Demo 2.1 Public Query Classes

Package cn.hadron.es;
Import Org.elasticsearch.action.search.SearchResponse;
Import org.elasticsearch.client.transport.TransportClient;
Import Org.elasticsearch.index.query.QueryBuilder;
Import Org.elasticsearch.search.SearchHit;

Import org.elasticsearch.search.SearchHits;

Import Java.util.Map;
    public class Queryutil {private String index= "index";
    private int size=3;
    Private searchhits hits;

    Private Transportclient client = Esutil.getclient ();
        Public Queryutil (String index,int size) {this.index=index;
    This.size=size; Public queryutil Query (querybuilder query) {//Search results are deposited in SearchResponse searchresponse RESPONSE=CLIENT.P
                Reparesearch (Index). Setquery (query)//set up the Finder. SetSize (size)//number of documents queried at a time
        . get ();
        This.hits=response.gethits ();
    return this;
        public void print () {if (hits==null) {return;
for (Searchhit hit:hits) {            System.out.println ("Source:" +hit.getsourceasstring ());
            System.out.println ("Index:" +hit.getindex ());
            System.out.println ("Type:" +hit.gettype ());
            SYSTEM.OUT.PRINTLN ("ID:" +hit.getid ());
            Traverse each field of the document Map<string,object> Map=hit.getsourceasmap ();
            For (String Key:map.keySet ()) {System.out.println (key+ "=" +map.get (key));
 }
        }
    }
}

2.2 Query Instances

(1) Matchquery

Package cn.hadron.es;
Import Org.elasticsearch.index.query.QueryBuilder;
Import org.elasticsearch.index.query.QueryBuilders;
public class FullTextQuery {public
    static void Main (string[] args) {
        queryutil util=new queryutil ("website", 5);
        //Construct query objects
        QueryBuilder qb=querybuilders.matchquery (
                "title",
                "CentOS");
        Util.query (QB). print ();
    }

(2) Operator

public static void Main (string[] args) {
        queryutil util=new queryutil ("website", 5);
        Constructs the query object
        //querybuilder qb=querybuilders.matchquery ("title", "CentOS");
        QueryBuilder qb=querybuilders
                . Matchquery ("title", "CentOS Upgrade")
                . Operator (Operator.and);
        Util.query (QB). print ();
    

source:{"title": "CentOS upgrade gcc", "Author": "Cheng", "postdate": "2016-12-25", "abstract": "CentOS upgrade gcc", "url": "http:// url.cn/53868915 "}
index:website
type:blog
id:3
author= Cheng
Abstract =centos upgrade gcc
title=centos upgrade gcc
url=http://url.cn/53868915

(3) Multimatchquery

    public static void Main (string[] args) {
        queryutil util=new queryutil ("website", 5);
        QueryBuilder qb=querybuilders.multimatchquery ("CentOS", "title", "Abstract");
        Util.query (QB). print ();
    

source:{"title": "CentOS replacement of domestic yum source", "Author": "Cheng", "postdate": "2016-12-30", "abstract": "CentOS replacement of domestic yum source", "url": " http://url.cn/53946911 "}
index:website
type:blog
id:6
author=
Cheng postdate=2016-12-30 Abstract=centos replacement of domestic yum source
Title=centos replacement of domestic yum source
url=http://url.cn/53946911
source:{"title": " Build ember development environment "," Author ":" Cheng "," postdate ":" 2016-12-30 "," abstract ":" CentOS under the Ember development environment "," url ":" http://url.cn/ 53947507 "}
index:website
type:blog
id:7
author=
Cheng postdate=2016-12-30 abstract= CentOS Build Ember Development environment
title= Build Ember development environment
url=http://url.cn/53947507
source:{"title": "CentOS upgrade gcc", " Author ":" Cheng "," postdate ":" 2016-12-25 "," abstract ":" CentOS upgrade gcc "," url ":" http://url.cn/53868915 "}
Index: Website
type:blog
id:3
author= Cheng postdate=2016-12-25 abstract=centos
upgrade gcc
title =centos Upgrade GCC
url=http://url.cn/53868915

(4)