Embedding Version Migration Strategy

Plan a migration strategy for updating embedding models in production.

## Current State
- Model: {{current_model}}
- Vectors: {{vector_count}}
- Index size: {{index_size}}

## Target Model
{{target_model}}

## Constraints
- Downtime tolerance: {{downtime_tolerance}}
- Reindexing budget: {{reindexing_budget}}

Develop a migration plan:

**Phase 1: Preparation**
- Parallel infrastructure setup
- Validation dataset creation
- Rollback procedures

**Phase 2: Dual-Write Period**
- Write to both indexes
- Read from old index
- Monitor consistency

**Phase 3: Cutover**
- Traffic shifting strategy
- Validation checkpoints
- Rollback triggers

**Phase 4: Cleanup**
- Old index decommission
- Cost optimization
- Documentation update

Provide timeline and risk mitigation.