【ES常用查询】基于ElasticsearchRestTemplate及NativeSearchQuery的查询

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate;
import org.springframework.data.elasticsearch.core.query.Criteria;
import org.springframework.data.elasticsearch.core.query.CriteriaQuery;
import org.springframework.data.elasticsearch.core.query.IndexQuery;
import org.springframework.data.elasticsearch.core.query.NativeSearchQuery;
import org.springframework.data.elasticsearch.core.query.Query;
import org.springframework.stereotype.Service;
 
@Service
public class ElasticsearchService {
 
    @Autowired
    private ElasticsearchRestTemplate elasticsearchRestTemplate;
 
    public void index(Document document) {
        IndexQuery indexQuery = new IndexQuery();
        indexQuery.setId(document.getId().toString());
        indexQuery.setObject(document);
        elasticsearchRestTemplate.index(indexQuery);
    }
 
    public Page<Document> search(String queryString, int page, int size) {
        Query query = new NativeSearchQueryBuilder()
                .withQuery(queryStringQuery(queryString))
                .withPageable(PageRequest.of(page, size))
                .build();
 
        return elasticsearchRestTemplate.queryForPage(query, Document.class);
    }
 
    private QueryBuilder queryStringQuery(String queryString) {
        return new QueryStringQueryBuilder(queryString);
    }
}

这个代码示例展示了如何使用Spring Data Elasticsearch的ElasticsearchRestTemplate来执行索引和搜索操作。index方法用于将一个Document对象索引到Elasticsearch中，而search方法则使用NativeSearchQueryBuilder来构建一个搜索查询，并返回分页结果。这里的Document类应该是一个映射到Elasticsearch文档的实体类。