Deep Dive: How JetBrains Fleet Indexes 1M Line Codebases with Rust 1.85 and Kotlin 2.0

Indexing a 1,000,000-line Java codebase in under 800ms with 40% lower memory overhead than traditional IntelliJ IDEA indexing isn’t magic—it’s a deliberate, Rust 1.85-powered, Kotlin 2.0-orchestrated architecture that JetBrains spent 3 years building for Fleet. ⭐ rust-lang/rust — 112,402 stars, 14