August 2019
Intermediate to advanced
560 pages
13h 41m
English
Content preview from Advanced Elasticsearch 7.0
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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.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.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.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.
filter
The purpose of the filter aggregation is to screen the documents that fit a specified filter and provide a total count. It generally acts as the pre-screening step to nail down the scope of documents:
- Example: The purpose of this is to find the average changePercent on the date of 2019-02-1 in the cf_etf_hist_price index:
"aggs":{"avg_changePercent_at_date": {"filter":{"term": {"date":"2019-02-15"}},"aggs": {"avg_changePercent": {"avg":{"field": "changePercent"}}}}}
- Resulting buckets: The avg_changePercent_at_date value is 0.60385. There are 314 documents involved in the aggregation:
"avg_changePercent_at_date": {"doc_count": 314,"avg_changePercent": {"value": .6038535040014299}}
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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.