用java代码写一个elasticsearch分页查询

以下是Java代码示例：

import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.Client;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;

import java.util.ArrayList;
import java.util.List;

public class ElasticsearchPageQuery {

    public List<String> searchByPage(Client client, String index, String type, int pageNo, int pageSize) {
        List<String> results = new ArrayList<>();
        SearchResponse response = client.prepareSearch(index).setTypes(type)
                .setSource(new SearchSourceBuilder().query(QueryBuilders.matchAllQuery()))
                .setFrom((pageNo - 1) * pageSize).setSize(pageSize).setScroll(new TimeValue(60000)).get();
        SearchHits hits = response.getHits();
        long totalHits = hits.getTotalHits();
        for (SearchHit hit : hits) {
            results.add(hit.getSourceAsString());
        }
        return results;
    }
}

此代码使用Elasticsearch Java API执行分页查询。它使用`SearchSourceBuilder`来构建查询，并将结果从响应中提取到一个列表中。分页查询是通过设置`setFrom`和`setSize`来实现的。`setScroll`方法用于保留滚动上下文以便获取更多结果。