Elasticsearch Java REST高级客户端SearchScrollApi
版本：Elasticsearch 7.2.0
maven配置见：Elasticsearch Java REST高级客户端-DocumentApi
SearchScroll和search的使用时是很相似的，只是在search上多了个滚动
对人工智能感兴趣的同学，可以点击以下链接：
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https://www.cbedai.net/u014646662
下面是Elasticsearch 滚动查询（或是分页查询）
public static void searchScroll() {
RestHighLevelClient client = getClient();
final Scroll scroll = new Scroll(TimeValue.timeValueMinutes(1L));
SearchRequest searchRequest = new SearchRequest("movies");
searchRequest.scroll(scroll);
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
MatchQueryBuilder matchQueryBuilder = QueryBuilders.matchQuery("title", "you life");
searchSourceBuilder.query(matchQueryBuilder);
searchRequest.source(searchSourceBuilder);
SearchResponse searchResponse = null;
try {
searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
} catch (IOException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
String scrollId = searchResponse.getScrollId();
SearchHit[] searchHits = searchResponse.getHits().getHits();
var page = 1;
while (searchHits != null && searchHits.length > 0) {
SearchScrollRequest scrollRequest = new SearchScrollRequest(scrollId);
scrollRequest.scroll(scroll);
try {
searchResponse = client.scroll(scrollRequest, RequestOptions.DEFAULT);
} catch (IOException e) {
e.printStackTrace();
}
scrollId = searchResponse.getScrollId();
searchHits = searchResponse.getHits().getHits();
if (searchHits != null && searchHits.length > 0) {
page++;
System.out.println("第"+page+"页");
Arrays.asList(searchHits).stream().map(h -> h.getSourceAsString()).forEach(System.out::println);
}
}
ClearScrollRequest clearScrollRequest = new ClearScrollRequest();
clearScrollRequest.addScrollId(scrollId);
ClearScrollResponse clearScrollResponse;
try {
clearScrollResponse = client.clearScroll(clearScrollRequest, RequestOptions.DEFAULT);
boolean succeeded = clearScrollResponse.isSucceeded();
System.out.println("清除滚屏是否成功:" + succeeded);
} catch (IOException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
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;
}