add doc show, enhance search, add jsonpath to search and doc show

pkg/cfg/config.go

@@ -58,6 +58,8 @@ type Config struct {
 	Primary                        bool     // index allocation: -p
 	From, To, MaxItems             int      // search: flags
 	Filter                         []string // search: -F
+	Path                           string   // search+doc sh: -p
+	Subhelp                        bool     // search+doc sh: -H
 	Exclude                        string   // cluster compare: -e (regexp)
 	All, Verbose                   bool     // cluster status: -a -v
 	Persistent, Transient, Default bool     // -p -t -D cluster settings set