Arg2Key convert JSON string to golang-native.

GetIndex for bucket/indexName.

HandleCommand after parsing it with ParseArgs().

ParseArgs into Command object, return the list of arguments, flagset used for parseing and error if any.

WaitUntilIndexState comes to desired `state`, retry for every `period` mS until `timeout` mS.

Command object containing parsed result from command-line or program constructued list of args.