Using Ela for distributed search in Java API development

With the continuous development of the Internet and the increasing scale of data, the demand for data search and analysis is getting higher and higher. In the traditional stand-alone environment, the efficiency of searching and analyzing big data is far from meeting the needs of users. The emergence of distributed search engines has effectively solved this problem. This article will introduce how to use Ela in Java API development for distributed search.

What is Ela
Ela is a Java API based on the Elasticsearch open source distributed search engine, which can help developers quickly integrate search functions in Java projects. Elasticsearch is a Lucene-based distributed search engine that provides fast, accurate, and reliable search engine services by building real-time search applications.

How to use Ela for distributed search
First, you need to install Elasticsearch and create an index before using Ela for distributed search. An index is a place where data is stored that contains multiple documents, similar to a database table. In Elasticsearch, an index can store multiple types of documents, and each type can define multiple fields. The contents of the document are stored in fields, and the fields are stored in the index.

Then, introduce the Ela dependency into the Java project and create the Elasticsearch client.

Maven dependency:

<groupId>org.elasticsearch.client</groupId>
<artifactId>elasticsearch-rest-high-level-client</artifactId>
<version>7.9.3</version>

Create client:

RestHighLevelClient client = new RestHighLevelClient(

RestClient.builder(
    new HttpHost("localhost", 9200, "http")
)

);

Create search request and query conditions:

SearchRequest searchRequest = new SearchRequest ("index_name");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.matchQuery("field_name", "search_text"));
searchRequest.source(searchSourceBuilder);

Execute the search request and process the search results:

SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
SearchHits searchHits = searchResponse.getHits();
for (SearchHit hit : searchHits) {

Map<String, Object> sourceAsMap = hit.getSourceAsMap();
String field = (String) sourceAsMap.get("field_name");
// ...

}

As you can see, it is very convenient to use Ela for distributed search. Developers only need to focus on the construction of search requests and query conditions, and the processing of search results. At the same time, Ela can also sort and paginate search results.

Summary
Ela is a Java API based on the Elasticsearch open source distributed search engine, which can help developers quickly integrate search functions in Java projects. It is very convenient to use Ela for distributed search. You only need to focus on the construction of search requests and query conditions, and the processing of search results.

The above is the detailed content of Using Ela for distributed search in Java API development. For more information, please follow other related articles on the PHP Chinese website!