codeintel: Add disable indexer flag
Created by: efritz
Once we deploy the VM-based indexer, we'll need to ensure that we're not continuing to process indexes inside the cluster. This flag will help us in this transition:
- Process all indexes within cluster
- Deploy new VM-based service
- Disable indexing within cluster
- Start new VM-based service
- Check health; reset flag on issues, continue if the new service works well
- Remove in-cluster index code