Week of the year / sunday of the week

Week of the year is challenging when handling year rolling, etc. a previous article was:
Week of the year aggregations using Painless - Elastic Stack / Elasticsearch - Discuss the Elastic Stack

I found a simple solution to this problem, rather trying tog et week of the year, i decided to standardize on the "sunday of the week" this avoids all sorts of issue with leap years, rolling years, etc. its also a very simple script.



That's a great solution, thank you!

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