Just to give a little warning on the following (Because the og Topic was locked):
https://discussions.soti.net/thread/how-to-move-elastic-search-data-nodes-to-a-different-drive/
With the latest Update there was something additionally changed in the registry, if you use this now and delete the data directory you will loose your search data and the service isnt able to reindex it correctly.
If you just update and copy the data directory to a different drive it still works though.