August 2019
Intermediate to advanced
560 pages
13h 41m
English
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Moving function aggregation
The purpose of moving function aggregation is to execute a user-defined script with the values from the subset of buckets in a specified window size from the aggregation in the previous stage. The script parameter is used to specify the script to run and the window parameter is the size of the subset of buckets. The moving_fn aggregation must be processed with either the histogram or date_histogram aggregation. There are a few supported functions and we'll practice them in the following subsections. All functions are based on the common query and parent aggregation with a window size of 4 for the monthly closing price change from the buckets for the ACWF ETF in the cf_etf_hist_price index, as shown:
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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.