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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.
The other option to consider would be Elasticsearch (and by extension Opensearch as mentioned) which is better for more keyword-based retrieval - although it seems that Opensearch do support full semantic search, I haven't had the chance to use it before. With ElasticSearch you are (for now) restricted to performing a keyword-based retrieval followed by semantic-based reranking.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.