August 2019
Intermediate to advanced
560 pages
13h 41m
English
Content preview from Advanced Elasticsearch 7.0
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sampler
Instead of an unbound number of documents to process, the sampler aggregation can limit its sub-aggregation results by sampling the top scores within a shard by a shard_size parameter (the default value is 100).
- Example: The purpose is to limit the (significant_terms) sub-aggregation document size to 150 per shard in the cf_etf index:
"aggs": { "sampling": {"sampler": { "shard_size":150},"aggs": {"significant_terms_category": {"significant_terms": {"field": "category"}}}}}
- Resulting buckets: We can see thatdoc_count of the significant_terms_category aggregation is 150:
"sampling": {"doc_count": 150,"significant_terms_category": {"doc_count": 150,"bg_count": 314, "buckets": [{"key": "International","doc_count": 61,"score": 0.13425648148148153,"bg_count": ...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.