Module online_update 

Online Index Updates

Provides a unified interface for incrementally updating indexes without requiring a full rebuild. Supports:

• Incremental vector insertion
• Vector deletion with lazy cleanup
• Vector updates (delete + insert)
• Background maintenance operations
• Concurrent update handling

Design Principles

1. Non-blocking reads: Updates don’t block ongoing searches
2. Eventual consistency: Updates visible after brief delay
3. Lazy cleanup: Deleted vectors marked, cleaned up in background
4. Batch efficiency: Batching updates for better performance

Structs

DeltaLog

Delta log for tracking changes between index snapshots

MaintenanceResult

Result of a maintenance operation

OnlineIndex

Wrapper that adds online update capabilities to any index

OnlineUpdateConfig

Configuration for online updates

OnlineUpdateStats

Statistics for online update operations

UpdateBuffer

Buffer for batching online updates

Traits

OnlineUpdatable

Trait for indexes that support online updates