Want to use VBScript to run .bat file in a different folder

Going out on a limb I would suspect that the batch script requires its own parent folder to be the working directory. You can set the working directory accordingly by changing your code to this:

Set shell = CreateObject("WScript.Shell")
shell.CurrentDirectory = "C:\Users\js\Desktop\createIndex"
shell.Run "createindex.bat"

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If the above doesn't help you need to provide more information about what should happen and what actually does happen. Running the external command/script in visible mode and without automatically closing CMD usually helps with debugging:

shell.CurrentDirectory = "C:\Users\js\Desktop\createIndex"
shell.Run "cmd /k createindex.bat", 1, True