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astra
Astra is a structured log search and analytics engine developed by Slack and Salesforce (by slackhq)
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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.
Perhaps their team could have found something useful in KalDB from Slack which is based on Lucene:
https://github.com/slackhq/kaldb
NOTE:
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Hence, a higher number means a more popular project.