August 2019
Intermediate to advanced
560 pages
13h 41m
English
Content preview from Advanced Elasticsearch 7.0
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cardinality
Obtain the number of unique field values. According to the reference (https://www.elastic.co/guide/en/elasticsearch/reference/7.0/search-aggregations-metrics-cardinality-aggregation.html), the total count is approximate. This example aims to find the number of distinct morningstar categories in the cf_etf index. There are 80 categories:
"aggs": {"number_of_morningstar_category":{"cardinality": {"field": morningstar_category"}}}
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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.