ES 8.14 Java 代码调用，增加knnSearch 和 混合检索 mixSearch

1、pom依赖

        <dependency><groupId>org.elasticsearch.client</groupId><artifactId>elasticsearch-rest-client</artifactId><version>8.14.0</version></dependency><dependency><groupId>co.elastic.clients</groupId><artifactId>elasticsearch-java</artifactId><version>8.14.0</version></dependency><dependency><groupId>org.apache.commons</groupId><artifactId>commons-pool2</artifactId><version>2.9.0</version> <!-- 使用你所需的版本 --></dependency><dependency><groupId>jakarta.json.bind</groupId><artifactId>jakarta.json.bind-api</artifactId><version>2.0.0</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.13.2</version></dependency><dependency><groupId>org.glassfish</groupId><artifactId>jakarta.json</artifactId><version>2.0.1</version></dependency>

2、ES 8.1的相关接口 主要参考： Java封装Elasticsearch8常用接口方法（一）_elasticsearch8 java接口-CSDN博客

3、EsService 主要 增加knnSearch 和 混合检索 mixSearch

/*** KNN搜索** @param indexName 索引名称* @param vector 向量数据* @param field KNN字段名* @return KnnSearchResponse* @throws Exception*/public SearchResponse knnSearchTestTwo(String indexName, List<Float> vector, String field, List<String> list) throws Exception {ElasticsearchClient client = ESClientPool.getClient();KnnQuery knnQuery = KnnQuery.of(m -> m.field(field).queryVector(vector).numCandidates(100));SearchResponse<ObjectNode> response = client.search(s -> s.index(indexName).query(knnQuery._toQuery()).source(SourceConfig.of(sf -> sf.filter(f -> f.includes(list)))), ObjectNode.class);List<ObjectNode> result = new ArrayList<>();for (Hit<ObjectNode> hit : response.hits().hits()) {ObjectNode source = hit.source();source.put("score", hit.score());result.add(source);}log.info("SearchResponse: {}", JSON.toJSONString(result));ESClientPool.returnClient(client);return response;}/*** 混合查询测试** @param indexName 索引名称* @param searchText 查询文本* @param vector 向量* @param knnField KNN字段名* @return SearchResponse* @throws Exception*/public SearchResponse mixSearch(String indexName, String searchText, String searchField, List<Float> vector, String knnField, List<String> returnFields) throws Exception {ElasticsearchClient client = ESClientPool.getClient();MatchQuery searchTextQuery = new MatchQuery.Builder().field(searchField).query(searchText).build();KnnQuery knnQuery = new KnnQuery.Builder().field(knnField).queryVector(vector).numCandidates(100).build();// 创建must子句的bool查询，这里只有一个should子句BoolQuery boolQuery = new BoolQuery.Builder().must(searchTextQuery._toQuery()) // 必须满足的文本匹配.should(knnQuery._toQuery()) // 可以满足的向量相似性.build();SearchResponse<ObjectNode> response = client.search(s -> s.index(indexName).query(boolQuery._toQuery()).source(SourceConfig.of(sf -> sf.filter(f -> f.includes(returnFields)))), ObjectNode.class);ESClientPool.returnClient(client);return response;}