Elasticsearch Java REST高级客户端 MultiSearch Api

使用 MultiSearch Api 在一个http请求中并行执行多个Search请求。

public static void multiSearch() {
		var client = getClient();
		
		MultiSearchRequest msRequest = new MultiSearchRequest();
		
		SearchRequest request1 = new SearchRequest("movies");
		SearchSourceBuilder builder1 = new SearchSourceBuilder();
		builder1.query(QueryBuilders.matchQuery("title", "you"));
		request1.source(builder1);
		msRequest.add(request1);
		
		SearchRequest request2 = new SearchRequest("movies");
		SearchSourceBuilder builder2 = new SearchSourceBuilder();
		builder2.query(QueryBuilders.matchQuery("title", "life"));
		request2.source(builder2);
		msRequest.add(request2);
		
		try {
			MultiSearchResponse responses = client.msearch(msRequest, RequestOptions.DEFAULT);
			Arrays.asList(responses.getResponses()).stream()
			.map(item -> item.getResponse())
			.map(response -> response.getHits())
			.filter(hit -> hit != null)
			.forEach(hit -> hit.forEach(System.out::println));
			
		} catch (IOException e) {
			e.printStackTrace();
		}finally {
			close(client);
		}
	}
	
	/**

	 * 关闭客户端
	 * 
	 * @param client
	 */
	private static void close(RestHighLevelClient client) {
		try {
			client.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * 获取客户端
	 * 
	 * @return
	 */
	private static RestHighLevelClient getClient() {
		RestHighLevelClient client = new RestHighLevelClient(
				RestClient.builder(new HttpHost("elk-node01", 9200, "http"), new HttpHost("elk-node02", 9200, "http"),
						new HttpHost("elk-node03", 9200, "http")));
		return client;
	}