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Just use Keen.io and be done with it :)

Paying $10 per 1 Million events streamed and $1 for each 100 Million properties scanned, Algolia would be dead.

(working at Algolia) The biggest reason not going for Keen was indeed related to the cost.

Keen just stores blobs in Cassandra and does aggregation at query time. I can't imagine it would scale far enough to be useful in this situation.