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got-your-back
Got Your Back (GYB) is a command line tool for backing up your Gmail messages to your computer using Gmail's API over HTTPS.
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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.
I've used offlineimap in the past: http://www.offlineimap.org/
I use GYB, it stores emails in separate *.eml files, so it should be easily searchable.
There's Mailpiler (docker-compose.yml) for this exact use case.
and maildir-utils to index for search, https://www.djcbsoftware.nl/code/mu/
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