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There is no proper alternative today. There are awkward ways to achieve similar functionality:

• Use autoscaling to stop nodes data (replicas) from being placed on nodes. But, that framework itself has been re-written from Solr 8x to 9x, hence we don’t have a recommendation for users for a consistent way to achieve this. Also, 9x autoscaling framework doesn't support placement plugin chaining, and hence placement plugins shouldn't be used for a first class support of node roles.
  
• OVERSEER role is already available today, it indicates "preferred" overseer.