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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Disclosure: I work for AWS, but I do not work directly on Elasticsearch related services.
Elasticsearch is/was an "upstream" for Open Distro for Elasticsearch (which is a distribution / collection of software). As an "upstream", changes to the core Apache 2.0 licensed software was sent as pull requests to Elastic, which are usually merged. It isn't correct to say that AWS has not been contributing to the upstream Elasticsearch code under an Apache 2.0 license (and, also, signing the CLA to boot, which allows Elastic to relicense AWS contributions under SSPL).
Here's a sample of PRs from AWS developers that I could find:
https://github.com/elastic/elasticsearch/pull/61400
There is some discussion on the P2P Foundation regarding copyfarleft/copyfair/copyjustright however in my experience even the most popular copyfarleft isn't as adopted.
I have been gathering resources regarding copyfarleft licensing and projects here: https://github.com/LibreCybernetics/awesome-copyfarleft