Spring Boot 整合分布式搜索引擎 Elastic Search 实现 自动补全功能

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.elasticsearch.core.ElasticsearchTemplate;
import org.springframework.data.elasticsearch.core.completion.Completion;
import org.springframework.data.elasticsearch.core.completion.CompletionQuery;
import org.springframework.data.elasticsearch.core.completion.CompletionResult;
import org.springframework.stereotype.Service;
 
import java.util.List;
 
@Service
public class AutoCompleteService {
 
    @Autowired
    private ElasticsearchTemplate elasticsearchTemplate;
 
    public List<String> suggest(String query) {
        CompletionQuery queryBuilder = new CompletionQuery(query, "autocomplete");
        CompletionResult result = elasticsearchTemplate.suggest(queryBuilder, String.class);
        return result.getSuggestions().get(0).getOptions();
    }
}

这段代码定义了一个服务类AutoCompleteService，它使用ElasticsearchTemplate来执行基于给定查询的自动补全操作。suggest方法接收一个查询字符串，构建一个CompletionQuery，然后使用ElasticsearchTemplate的suggest方法执行查询，并返回补全结果的选项列表。