restHighLevelClient es 聚合查询 按规定时间格式分组

好的，如果您使用Java语言，可以使用Elasticsearch的Java客户端RestHighLevelClient进行聚合查询。以下是一个示例代码，按天分组：

import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.histogram.DateHistogramInterval;
import org.elasticsearch.search.aggregations.bucket.histogram.Histogram;
import org.elasticsearch.search.builder.SearchSourceBuilder;

import java.io.IOException;
import java.util.concurrent.TimeUnit;

public class AggregationExample {
    public void aggregationByDate(RestHighLevelClient client, String indexName, String dateField) throws IOException {
        SearchRequest searchRequest = new SearchRequest(indexName);
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        searchSourceBuilder.query(QueryBuilders.matchAllQuery());

        Histogram histogramAggregation = AggregationBuilders.dateHistogram("group_by_day")
                .field(dateField)
                .calendarInterval(DateHistogramInterval.DAY)
                .format("yyyy-MM-dd");

        searchSourceBuilder.aggregation(histogramAggregation);

        searchRequest.source(searchSourceBuilder);
        searchRequest.scroll(new TimeValue(60000L));

        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

        histogramAggregation = searchResponse.getAggregations().get("group_by_day");
        for (Histogram.Bucket bucket : histogramAggregation.getBuckets()) {
            String keyAsString = bucket.getKeyAsString();
            long docCount = bucket.getDocCount();
            System.out.println("日期：" + keyAsString + "，文档数量：" + docCount);
        }
    }
}

其中，`client`参数为您创建的RestHighLevelClient实例，`indexName`为您要查询的索引名，`dateField`为您要聚合的日期字段名。

您可以根据需要修改`calendarInterval`和`format`参数来实现不同的聚合需求。例如，如果您要按月份聚合，可以将`calendarInterval`设置为`DateHistogramInterval.MONTH`，并将`format`设置为`yyyy-MM`。

希望这能帮到您！