A. 1. Add new indexers to the cluster as peers, to a new site. 2. Ensure new indexers receive common configuration from the CM. 3. Decommission old indexers (one at a time) to allow time for CM to fix/migrate buckets to new hardware. 4. Remove all the old indexers from the CM's list.

B. 1. Add new indexers to the cluster as new site. 2. Update cluster master (CM) server.conf to include the new available site. 3. Allow time for CM to fix/migrate buckets to new hardware. 4. Remove the old indexers from the CM's list.

C. 1. Add new indexers to the cluster as peers, in the same site (if needed). 2. Ensure new indexers receive common configuration. 3. Decommission old indexers (one at a time) to allow time for CM to fix/migrate buckets to new hardware. 4. Remove all the old indexers from the CM's list.

D. 1. Add new indexers to the cluster as peers, in the same site. 2. Update the replication factor by +1 to Instruct the cluster to start replicating to new peers. 3. Allow time for CM to fix/migrate buckets to new hardware. 4. Remove all the old indexers from the CM's list.