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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.
Assuming you know the terms ahead of time, I think you are looking for an adjacency matrix aggregation. If you do not know the terms ahead of time, I'd recommend either using a plugin (like Carrot2) or performing the cluster analysis outside of ES (but driven from the ES index) and then piping the cluster IDs and other pertinent information back into the index.
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