code: func NewMain() *Main {
  	return &Main{
  		GenConcurrency: 1,
  		Num:            0,
  		PilosaHosts:    []string{"localhost:10101"},
  		Index:          "pdk",
  		BatchSize:      1000,
  		Proxy:          ":13131",
  	}
  }
docs: // NewMain returns a new Main.