August 2019
Intermediate to advanced
560 pages
13h 41m
English
Content preview from Advanced Elasticsearch 7.0
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scripted_metric
We execute the scripted_metric aggregation in four different stages: the init stage, the map stage, the combine stage, and the reduce stage. The corresponding script parameters are as follows:
- init_script: Optional parameter. A script for initialization, including an object named state to store the changes in the shard level.
- map_script: Required parameter. A script to perform at the document level if the document is included in the aggregation.
- combine_script: Required parameter. A script to perform in the shard level when all the documents are collected within a shard node. Finally, a value or an object is returned to the coordinating node.
- reduce_script: Required parameter. A script to perform in the coordinating node ...
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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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