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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.
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jackson-module-kotlin
Module that adds support for serialization/deserialization of Kotlin (http://kotlinlang.org) classes and data classes.
The OSI has control of the Open Source Certification, but that doesn't mean that anything that doesn't have that certification is "closed source" as you put it. While some people might argue about whether something is truly "open" depending on the license, "closed source" has a pretty specific meaning... that the source code isn't publicly available. With Elasticsearch, at least currently, that's quite obviously not the case.
Not really, you just need to handle some standard types and have a good extension mechanism to let the user implement factories. That library having built in support for UUID and datetime is probably a bit much, I'd prefer a plugin like https://github.com/FasterXML/jackson-module-kotlin