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opengrok
OpenGrok is a fast and usable source code search and cross reference engine, written in Java
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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.
Glean was recently open sourced, it might fit your needs - https://glean.software/
I used it a long time ago, but I see this is still around: https://oracle.github.io/opengrok/
NOTE:
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