At 2:17 AM on a Tuesday, our Elasticsearch 8 cluster hit a p99 search latency of 4.2 seconds, triggered a cascade of 12 downstream timeouts, and cost us $14k in SLA credits. Three months later, our Typesense 0.25 deployment serves the same 12TB product catalog with p99 latency of 380ms, 3x faster than the old setup, at 40% of the infrastructure cost. This is the unvarnished postmortem of that migration.

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