I noticed my disk space is getting pretty low on my laptop. I used Treesize to determine that one of the biggest files was my Windows.edb file at 15.5GB in size.
This is linked to the Windows Search services, and it contains information designed to make my searching faster.
To reduce the size of this file, we can rebuild the index.
Go to Control Panel
Select Indexing Options
Select the Advanced button, then select the Rebuild button.
This will take a while now, but it will delete the windows.edb and associated files and commence reindexing your machine.
EDIT – February 2017 – Microsoft released a patch that stopped the windows.edb from growing to such large extents. They included that patch in an update rollup for Windws 8 and Windows Server 2012. You can find out more here