August 2019
Intermediate to advanced
560 pages
13h 41m
English
Content preview from Advanced Elasticsearch 7.0
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cumulative_sum
The purpose of this is to calculate the accumulative summation value of each bucket from the aggregation in the previous stage:
- Example: The purpose is to compute the cumulative sum of the closing price change side by side with the monthly closing price change for the ACWF ETF in the cf_etf_hist_price index. We can see that the monthly_change aggregation is the parent of the change_on_month and cumulative_change aggregations:
"query":{"match": {"symbol":"ACWF"}},"aggs":{"monthly_change": {"date_histogram":{"field": "date","interval": "month","format": "yyyy-MM-dd"},"aggs":{"change_on_month":{"sum":{"field":"change"}},"cumulative_change":{"cumulative_sum": {"buckets_path": "change_on_month"}}}}
- Resulting buckets: The cumulative_change ...
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