Springboot2.1.1使用rest-high-level-client整合Elasticsearch6.4.3

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>6.4.3</version>
</dependency>

spring.elasticsearch.rest.uris=http://xxx.xxx.xxx.xxx:9200

@Service
public class ElasticSearchService {

    private Logger logger = LoggerFactory.getLogger(ElasticSearchService.class);

    // 在配置文件中已经配置，此处直接可以使用
    @Resource
    private RestHighLevelClient client;

    public boolean isExist(String reference) throws IOException {
        // 1、查询条件
        MatchQueryBuilder matchQueryBuilder = QueryBuilders.matchQuery("DREREFERENCE", reference);

        // 2、封装boolBuilder等一系列内容
        BoolQueryBuilder boolBuilder = QueryBuilders.boolQuery();
        boolBuilder.must(matchQueryBuilder);
        // 封装sourceBuilder
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        // 设置查询，可以是任何类型的QueryBuilder
        sourceBuilder.query(boolBuilder);
        // 设置确定结果要从哪个索引开始搜索的from选项，默认为0
        sourceBuilder.from(0);
        // 设置确定搜素命中返回数的size选项，默认为10
        sourceBuilder.size(1);
        // 设置一个可选的超时，控制允许搜索的时间
        sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));
        // 第一个是获取字段，第二个是过滤的字段，默认获取全部
        sourceBuilder.fetchSource(new String[] {"DREREFERENCE","DRETITLE"}, new String[] {});
        // 索引
        SearchRequest searchRequest = new SearchRequest("full-sight-v1");

        // 3、封装searchRequest
        searchRequest.source(sourceBuilder);

        // 4、查询
        SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);

        // SearchHits提供有关所有匹配的全局信息，例如总命中数或最高分数
        SearchHits hits = response.getHits();
        SearchHit[] searchHits = hits.getHits();
        for (SearchHit hit : searchHits) {
            logger.info("search -> {}",hit.getSourceAsString());
        }

        return searchHits.length > 0;
    }
}