//language=JSON5
		String str = "{\n" +
				"  \"match_all\": {}\n" +
				"}";
		WrapperQueryBuilder wrapperQueryBuilder =   QueryBuilders.wrapperQuery(str);
		
        // 执行搜索 使用elasticsearchTemplate.getClient()获取client
		SearchResponse searchResponse = elasticsearchTemplate.getClient().prepareSearch(StudentTaskStatusDocument.INDEX_NAME)
				.setTypes(StudentTaskStatusDocument.TYPE).setQuery(wrapperQueryBuilder).setSize(20).get();
		SearchHit[] hits = searchResponse.getHits().getHits();
		System.out.println("");

其他参考资料：

https://blog.csdn.net/tcyzhyx/article/details/84566734