August 2019
Intermediate to advanced
560 pages
13h 41m
English
Content preview from Advanced Elasticsearch 7.0
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serial_diff
The purpose of this is to compute a series of value differences between a time lag of the buckets from the aggregation in the previous stage. The parameter lag is the prior nth bucket used for subtraction from the current bucket:
- Example: The purpose is to compute a series of the differences of the weekly average changes of closing prices side by side with the weekly average changes of closing prices for the ACWF ETF in the cf_etf_hist_price index:
"query":{"match": {"symbol":"ACWF"}},"aggs":{"serial_diff_weekly_avg_change": {"date_histogram":{"field": "date","interval": "week","format": "yyyy-MM-dd"},"aggs":{"weekly_avg_change":{"avg":{"field":"change"}},"weekly_avg_serial_diff": {"serial_diff": {"buckets_path":"weekly_avg_change","lag":1}}}}} ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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