java结合es查询

Java结合ES查询可以使用ES官方提供的Java API，具体步骤如下：

1. 引入ES Java API的依赖包；
2. 创建ES客户端连接；
3. 构建查询条件；
4. 执行查询并处理结果。

以下是一个简单的示例代码：

// 引入依赖包
<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.10.2</version>
</dependency>

// 创建ES客户端连接
RestHighLevelClient client = new RestHighLevelClient(
        RestClient.builder(new HttpHost("localhost", 9200, "http")));

// 构建查询条件
SearchRequest searchRequest = new SearchRequest("index_name");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.matchQuery("field_name", "query_text"));
searchRequest.source(searchSourceBuilder);

// 执行查询并处理结果
SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
SearchHits hits = searchResponse.getHits();
for (SearchHit hit : hits) {
    String sourceAsString = hit.getSourceAsString();
    // 处理查询结果
}

// 关闭客户端连接
client.close();