Elasticsearch Java API boolQuery

Question

我正在使用Elasticsearch 6.4.2版本

我成功使用REST API创建了GET查询，现在我想使用JAVA api执行相同的查询。

这是查询：

GET _search
{
   "query":{
      "bool":{
         "must":{
            "match":{
               "tags":"kpi"
            }
         },
         "filter":{
            "range":{
               "@timestamp":{
                  "gt":"now-5m"
               }
            }
         }
      }
   }
}

我阅读了此文档： https : //www.elastic.co/guide/zh-CN/elasticsearch/client/java-api/current/java-compound-queries.html，但对于我是否仍然不清楚寻找以及如何使用它。 考虑到查询可能返回很多必须由我的Java应用程序处理的结果。

另外，由于我必须每5分钟执行一次此查询，因此如何优化它（如果可能）？

Answer 1

如果您的项目是基于Maven的，则可以使用elasticsearch客户依赖项：

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>transport</artifactId>
    <version>5.6.2</version>
</dependency>

您需要的查询为：

val query = QueryBuilders.boolQuery()
    .must(
        QueryBuilders.rangeQuery("timestamp").from(startDate)
    )
    .must(
        QueryBuilders.termQuery("tags", "kpi")
    )

最后要执行查询，您可以使用client.search(query) 。 client是RestHighLevelClient类型。

Answer 2

这是有效的确切代码：

Date dateFrom = new Date(System.currentTimeMillis() - 300 * 1000);
Date dateTo = new Date(System.currentTimeMillis());

BoolQueryBuilder query = QueryBuilders.boolQuery()
    .must(QueryBuilders.rangeQuery("@timestamp").from(dateFrom).to(dateTo))
    .must(QueryBuilders.matchQuery("tags", "kpi"));

SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(query);
SearchRequest searchRequest = new SearchRequest();
searchRequest.source(searchSourceBuilder);
System.out.println(query.toString());
SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

logger.log(Level.INFO, "Status: {0}", new Object[] { searchResponse.status() });
logger.log(Level.INFO, "Took: {0}", new Object[] { searchResponse.getTook() });
logger.log(Level.INFO, "IsTerminatedEarly: {0}", new Object[] { searchResponse.isTerminatedEarly() });
logger.log(Level.INFO, "TimedOut: {0}", new Object[] { searchResponse.isTimedOut() });
logger.log(Level.INFO, "TotalShards: {0}", new Object[] { searchResponse.getTotalShards() });
logger.log(Level.INFO, "SuccessfulShards: {0}", new Object[] { searchResponse.getSuccessfulShards() });
logger.log(Level.INFO, "FailedShards: {0}", new Object[] { searchResponse.getFailedShards() });
logger.log(Level.INFO, "Total Hits: {0}", new Object[] { searchResponse.getHits().getTotalHits() });