Mingyi World Elasticsearch

Sep 24, 2025 · Big Data

How 3 Simple Tweaks Doubled Elasticsearch Scan Performance on 40M Docs

The article details a real‑world case of scanning over 40 million Elasticsearch documents, identifies four performance bottlenecks, and presents three concrete optimizations—_source filtering, precise index targeting, and batch‑size tuning—that together cut processing time in half and raise CPU utilization from 25% to 85%.