def list_available_clusters(custom_headers:nil)
      response = list_available_clusters_async(custom_headers:custom_headers).value!
      response.body unless response.nil?
    end
def list_available_clusters(custom_headers:nil)
      response = list_available_clusters_async(custom_headers:custom_headers).value!
      response.body unless response.nil?
    end
List the quantity of available pre-provisioned Event Hubs Clusters, indexed
 by Azure region.

 @param custom_headers [Hash{String => String}] A hash of custom headers that
 will be added to the HTTP request.

 @return [AvailableClustersList] operation results.