docs: def cluster_health_for_indices(self, index=None, params={}, **kwargs):
          """
          Return a list of cluster health of specified indices(default all),
          the first element is a dictionary represent a global information of the cluster
          such as "cluster_name", "number_of_nodes"...
          the second element represent a indices information list that each element is a dictionary for one index
          such as [{'index' : 'a', 'status' : 'yellow', ...} , {'index' : 'b', 'status' : 'yellow', ...}, ....]
          """
          params['level'] = 'indices'
          result = self.cluster_health(index, params, **kwargs)
          return self._process_cluster_health_info(result)