code: func (c *InternalClient) MaxShardByIndex(ctx context.Context) (map[string]uint64, error) {
  	span, ctx := tracing.StartSpanFromContext(ctx, "InternalClient.MaxShardByIndex")
  	defer span.Finish()
  	return c.maxShardByIndex(ctx)
  }
docs: // MaxShardByIndex returns the number of shards on a server by index.