June 2017
Beginner to intermediate
404 pages
8h 22m
English
Content preview from Learning Elasticsearch
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Aggregations on child documents
As defined in the sample data, we have the products as parent documents and the product reviews as children documents. A sample document is shown next:
PUT chapter8/product/1?refresh=true { "product_name": "iPhone 6", "manufacturer": "Apple", "variations": [ { "color": "Gray", "storage": "16GB", "unit_price": "600" } ] } #Child Documents POST chapter8/product_review/?parent=1 { "user_id": "user1", "comment": "One of the best phones in the market" }
Suppose we want to find the number of product reviews for each manufacturer. The product review is in the child document, and the manufacturer is in the parent document. Due to parent-child mapping, to use the children aggregation, the child document type (
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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.