hello there
which Cluster Master is actually the live one? if the live one is in Prod, ill recommend to use the HA Master as the Search Head.
i am not sure an indexer peer can also be a search peer, meaning, connect to the Cluster Master as a Search Head and receive all the other indexers including itself as search peers
other approaches i can recommend:
1. another VM in your production site to work as a DR SH
2. a cloud instance that can see your indexers. if it doesnt work a lot, it can be pretty cheap too.
hope it helps
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