使用Java Api 查询ElasticSearch 索引中的全部数据

public class ESTest_Doc_Query {
    public static void main(String[] args) throws Exception {
        //创建ES客户端
        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost",9200,"http"))
        );

        //1、查询索引中全部数据
        SearchRequest request = new SearchRequest();
        request.indices("user");

        request.source(new SearchSourceBuilder().query(QueryBuilders.matchAllQuery()));

        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
        SearchHits hits = response.getHits();
        System.out.println(hits.getTotalHits());
        System.out.println(response.getTook());

        for(SearchHit hit : hits){
            System.out.println(hit.getSourceAsString());
        }

        //关闭ES客户端
        esClient.close();
    }
}