Windows Indexing filling up with hidden files

Question

How can I see or control why Windows Indexing is filling up this drive?

See this report from Tree Size (as Administrator):

Only about 200 GB is reported, but Windws says 254 GB used.

Now when I rebuild the Windows Index database:

135 GB is freed up!

Where did all that space came from?

I have changed settings for indexing so it only index users Outlook, but this still happen every 2 weeks or so.

Answer 1

I have not had this issue in a long time now, so I think it's time to close.

I also created a thread on MS Partner forum, but it didn't bring anything new.