op.calendarInterval(DateHistogramInterval.HOUR);
                    op.subAggregation(AggregationBuilders.avg(QUERY_TIME).field(QUERY_TIME));
                    op.minDocCount(0);
                    op.order(BucketOrder.key(true));
                }, null);
            });

                    type: string
                    example: bd60f9579a494dfd8c03db7c8aa905b0
                  exec_time:
                    type: number
                    example: 0.21
                  query_time:
                    type: integer
                    format: int64
                    example: 0
                  page_size:
                    type: integer
                    example: 20