Elasticsearch无法使用Java API查询获取超过10个文档

import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.sort.SortOrder;

public class ElasticsearchExample {
    public static void main(String[] args) {
        try (RestHighLevelClient client = new RestHighLevelClient()) {
            SearchRequest searchRequest = new SearchRequest("index_name");
            SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
            sourceBuilder.query(QueryBuilders.matchAllQuery());
            sourceBuilder.size(20); // 设置返回的文档数量为20
            searchRequest.source(sourceBuilder);

            SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
            // 处理搜索结果
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}