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Reprint: Http://m.blog.csdn.net/u012546526/article/details/74184769Elasticsearch Java API Common query Methods QueryBuilder Construction Example Environment Elasticsearch version5.1.1PomDependency> groupId>Org.elasticsearchgroupId> Artifactid>ElasticsearchArtifactid> version>5.1.1version>Dependency>Elasticsearch Index Mode number{ "type": "Long"}Strin
[Elasticsearch] control relevance (2)-The PSF (Practical Scoring Function) in Lucene is upgraded during Query
Practical Scoring Function in Lucene
For Multiterm Queries, Lucene uses the Boolean Model, TF/IDF, and Vector Space Model to combine them, used to collect matching documents and calculate their scores.
Query multiple entries like the following:
GET /my_
This chapter is translated from the partial matching chapter of the official Elasticsearch guide.Instant Search during query (Query-time search-as-you-type)Now let's look at how prefix matching can help with full-text search. The user is accustomed to seeing the search results before completing the input-this is called an Instant Search (Instant search, or Search
Demoindex:Use head for the following query, the results found that the results are not available. Here I have checked "show query statement".Unable to find the answer had to resort to "Elasticsearch server development." After reviewing the nested types of nested queries need to use a dedicated search format. First post the original book Description:{"Cloth": {"P
Elasticsearch's Javaapi query dsl-filtersand theLike the REST query DSL, Elasticsearch provides a complete Java query DSL. The Factory filter Builder isFilterBuildersOnce you have your query ready, you can use the query API.How do
result set in cases where queries are paged with page and slice.
Note that if you use the sort parameter to sort the results of a query and add a limit to the size of the result set, you can easily get the largest k elements or the smallest k elements.
3. using scan and scroll to process large result sets
The Elasticsearch can use scan and scroll when working with large result sets. In spring Data
In the 2.X version, this delete by query function was removed because the official thought it would cause some errors to install the plugin itself if needed.Bin/plugin Install Delete-by-queryWhen you need to useDELETE/Index name/type/_query{"query"needed to be emptied: {"match_all " : {}}}Then in the 5.x version of the API is again the official back to the self-feature. That's what the new feature says.Dele
[Elasticsearch] adjacent match (3)-performance, associated word query and ShinglesImprove Performance
Phrase and closeness queries are more expensive than simple match queries. The match query only checks whether the entry exists in the Inverted Index, while the match_phrase Query Needs to calculate and compare Multipl
work exactly the same way as prefix queries. They also need to traverse the list of entries in the inverted index to find all the matching entries, and then collect the corresponding document IDs on a per-entry basis. The only difference between them and prefix queries is that they can support more complex schemas.This also means that there is the same risk of using them. It is very resource-intensive to run such queries on a field that contains many different entries. Avoid using a pattern tha
I was asked this question when I was reporting to my superiors today, and I didn't come back.English Original:Https://www.elastic.co/guide/en/elasticsearch/guide/current/_queries_and_filters.htmlThe first thing we talked about is structured query statements, in fact we can use two structured statements: Structured queries (query DSL) and structured filtering (fil
First, a query, you need to establish a searchrequestbuilder, which will give a query for which index or type, and all the settings can be implemented here, such as fuzzy query, scope query, prefix query.Searchrequestbuilder Responsebuilder = Client.preparesearch ("case"). Settypes ("Case_info");Two. Total number of st
(600000)). Execute (). Actionget (); //break condition:no Hits is returned if (Scrollresp.gethits (). Gethits (). Length = = 0) { break; }}Threading OperationsThe search API allows you to set up threads to perform operations so that the actual ginger execution API executes on the same node (the API executes on a shard that is assigned on the same server).There are three kinds of threading modes, the NO_THREADS mode means that the query operati
The and symbol determines that multiple columns exist: {"Filter": {"and": [{"Exists": {"Field": "Sid"}},{"Exists": {"Field": "Level"}}]}} BOOL Combination {"Filter": {"and": [{"or": [{"Match_phrase": {"DisplayName": "S"}},{"Match_phrase": {"DisplayName": "L"}}]},{"Match_phrase": {"DisplayName": "A"}},{' Not ': {"Match_phrase": {"displayname": "P"}}}]}} Note: Similar and symbols replaced with bool must actually result in the same;Elasticsearch determin
Query type
QueryType
Description
Background code Sample
Matchallquery
Full match
QueryBuilder QB = Matchallquery ();
Matchquery
Single match
QueryBuilder QB = Matchquery ("Name","Kimchy Elasticsearch");
Multimatchquery
Multi-field Single value matching
QueryBuilder QB = Multimatchquery ("Kimchy
I want to implement an effect similar to the following SQL statement:Select * from where inch ('7a482589-e52e-0887-4dd5-5821aab77eea',' C68ACE46-1C07-FCCF-1CB6-57D4E77E40A2','3c9263d2-c44b-a9fd-155e-57aaf783ed58 ','69b087df-eb62-3e70-2cc0-582ec84a561b')The corresponding ES query should be written as:$v is a collection of rw_id, GET/_search{ "query" : {"Filtered" : {"Filter
Next introduction to ORM Query Language (oql)-instanceI. SQL and ORM
Relational Database Service (RDBMS) queries are structured query languages (Structured Query Language). Compared with advanced programming languages (imperative languages), SQL mainly describes what to do,
SQL language query basics: Connection QueryYou can use the join operator to query multiple tables. Connection is the main feature of the relational database model and a symbol that distinguishes it from other types of database management systems.In the relational database management system, the relationship between data does not have to be determined when a table
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