August 2019
Intermediate to advanced
560 pages
13h 41m
English
Content preview from Advanced Elasticsearch 7.0
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bucket_selector
The purpose of this is to perform a filter to select the buckets from the aggregation in the previous stage:
- Example: The purpose is to discover the negative monthly closing price change from the buckets for the ACWF ETF in the cf_etf_hist_price index:
"query":{"match": {"symbol":"ACWF"}},"aggs":{"negative_monthly_change": {"date_histogram":{"field": "date","interval": "month","format": "yyyy-MM-dd"},"aggs":{"change_on_month":{ "sum":{"field":"change"}},"filter_positive_change_on_month":{"bucket_selector":{"buckets_path":{"monthly_change_value":"change_on_month"},"script":"params.monthly_change_value<0"}}}}
- Resulting buckets: The negative_monthly_change field shows only the negative monthly closing price change:
"negative_monthly_change": ...
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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.
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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.