Elasticsearch 中查询结果分页实现的java代码

在 Elasticsearch 中，分页查询可以通过设置 `from` 和 `size` 参数来实现。具体实现步骤如下：

1. 创建 Elasticsearch 客户端和搜索请求对象 `SearchRequest`。

RestHighLevelClient client = new RestHighLevelClient(RestClient.builder(new HttpHost("localhost", 9200, "http")));
SearchRequest searchRequest = new SearchRequest("index_name");

2. 设置查询条件和分页参数。

SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.matchQuery("field_name", "search_text"));
searchSourceBuilder.from(0);
searchSourceBuilder.size(10);
searchRequest.source(searchSourceBuilder);

上述代码中，`from` 参数表示结果集的起始位置，`size` 参数表示每页显示的结果数。

3. 执行搜索请求并处理结果。

SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
SearchHits hits = searchResponse.getHits();
SearchHit[] searchHits = hits.getHits();

for (SearchHit hit : searchHits) {
    // 处理每个搜索结果
}

client.close();

完整代码示例：

RestHighLevelClient client = new RestHighLevelClient(RestClient.builder(new HttpHost("localhost", 9200, "http")));
SearchRequest searchRequest = new SearchRequest("index_name");

SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.matchQuery("field_name", "search_text"));
searchSourceBuilder.from(0);
searchSourceBuilder.size(10);
searchRequest.source(searchSourceBuilder);

SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
SearchHits hits = searchResponse.getHits();
SearchHit[] searchHits = hits.getHits();

for (SearchHit hit : searchHits) {
    // 处理每个搜索结果
}

client.close();