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Transforming data

Transforms enable you to convert existing Elasticsearch indices into summarized indices, which provide opportunities for new insights and analytics. For example, you can use transforms to pivot your data into entity-centric indices that summarize the behavior of users or sessions or other entities in your data. Or you can use transforms to find the latest document among all the documents that have a certain unique key.

Overview
Setup
When to use transforms
Generating alerts for transforms
Transforms at scale
How checkpoints work
API quick reference
Tutorial: Transforming the eCommerce sample data
Examples
Painless examples
Troubleshooting transforms
Limitations

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https://www.elastic.co/guide/en/elasticsearch/reference/8.17/transforms.html