Index Rebuild

An index rebuild is the process of recomputing the entire ANN index structure from the current set of vectors, typically scheduled periodically to keep the index optimally organized after many incremental inserts and deletes. IVF indexes in particular require rebuilds when cluster centroids drift from the actual data distribution. Rebuilds are compute-intensive and require careful orchestration — often maintaining a hot copy of the old index while the new one warms up — to avoid serving degraded results during the rebuild window.