August 2019
Intermediate to advanced
560 pages
13h 41m
English
Content preview from Advanced Elasticsearch 7.0
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reverse_nested
The purpose of this is to perform aggregation on the field from the parent document after grouping by the field from the nested object:
- Example: The purpose is to count the total ETFs according to the category based on the grouping by the type of dividend in the cf_etf_dividend_nested index:
"aggs": {"etf_category_distribution_on_dividend_type":{"nested": {"path":"announcement"}, "aggs":{"by_dividend_type": { "terms": {"field":"announcement.type"}, "aggs": {"total_by_etf_category":{"reverse_nested":{}, "aggs": { "category":{"terms": {"field": "category"}}}}}}}}}
- Resulting buckets: We can see that there are three dividend types: Dividend income, Long term capital gain, and Short term capital gain. In each dividend type, the ...
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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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