def remove_by_id(class_name, *ids)
      ids.flatten!
      @connection.delete_by_id(
        ids.map { |id| Adapters::InstanceAdapter.index_id_for(class_name, id) }
      )
    end
def remove_by_id(class_name, *ids)
      ids.flatten!
      @connection.delete_by_id(
        ids.map { |id| Adapters::InstanceAdapter.index_id_for(class_name, id) }
      )
    end
Remove the model from the Solr index by specifying the class and ID