add index create,delete, enhance index show, catch empty index arg

pkg/cfg/config.go

@@ -46,6 +46,8 @@ type Config struct {
 	DefaultCluster     *Cluster
 	Index              string   // index: -i
 	Failed, Partials   bool     // index: flags
+	Shards, Replicas   int      // index create: -s -r
+	Wait               bool     // index create: -w
 	From, To, MaxItems int      // search: flags
 	Filter             []string // search: -F
 	Exclude            string   // cluster compare: -e (regexp)