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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.
Windows: Velocity (https://velocity.silverlakesoftware.com/)
all support a healthy amount of documentation that you can download and most importantly a very healthy amount of integrations from Vim (https://github.com/KabbAmine/zeavim.vim) to VSCode (https://github.com/deerawan/vscode-dash) - note that on Windows all these apps write to the registry as "Zeal" so remember to uninstall the previous one if you're switching between them.
If you just need a searchable docset that can be made available offline, there's also DevDocs (https://devdocs.io/) - just note that downloaded documentation can disappear if you regularly use the same browser for normal internet use - I'd do things like grab a copy of ungoogled chromium and just use it for this site before traveling if you're gonna be offline for a while (alternatively, there's some electron versions out there and you could package it that way for yourself too)