August 2019
Intermediate to advanced
560 pages
13h 41m
English
Content preview from Advanced Elasticsearch 7.0
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bucket_script
The purpose of this is to perform and process a user-defined script for each bucket from the aggregation in the previous stage. The script parameter lets us specify the contents of the script:
- Example: The purpose is to find the range value (max-min) of the closing price change side by side with the monthly closing price change. This is the min/max range for the ACWF ETF in the cf_etf_hist_price index:
"query":{"match": {"symbol":"ACWF"}},"aggs":{"monthly_change": {"date_histogram":{"field": "date","interval": "month","format": "yyyy-MM-dd"},"aggs":{"change_on_month":{ "sum":{"field":"change"}},"min_change_on_month":{"min":{"field":"change"}},"max_change_on_month":{"max":{"field":"change"}},"range_of_change":{"bucket_script":{"buckets_path":{"min_value":"min_change_on_month", ...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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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.