How does ES bucket scripting work internally?
Is it scalable to add multiple bucket scripts into the same aggregations ...
If you are talking about the bucket_script aggregation then you can indeed add multiple bucket_script aggregations with the same parent aggregation. The bucket_script aggregations will be run sequentially after any non-pipeline aggregations have be processed in the reduce phase on the coordinating node. This means that each bucket_script you run will add time to the total time taken to complete the search request. We recommend that the scripts used in the bucket_script are relatively simple.
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