In Windows 10 or Windows Server 2012, the Windows Search Service may bloat the Windows.edb file. When this issue occurs, the Windows.edb file grows to a very large size and consumes lots of disk space. In some instances, the file size can be larger than 70 gigabytes (GB).
Windows.edb is a database file of the Windows Search service… content indexing, etc.

To resolve this issue, follow the next steps.

Step 1. Download and install WinDirStat. https://windirstat.net/

Step 2. Open WinDirStat and select the drive you want to scan. (In this case we selected the C: drive)

Step 3. After the scan you are going to notice a big file called Windows.edb.

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Step 4. In order to delete the file, we need to stop the service first. Let’s do a Win + R and type services.msc.

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Step 5. Let’s look for Windows Search, right click and select Stop.

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Step 6. Now we can go back to WinDirStat and delete the file, I’m going to select Delete (no way to undelete!) cause I won’t need that file. (Right click to display the menu)

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Step 7. Click Yes on the Warning box.

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Step 8. Now confirm the deletion clicking Yes.

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Done!

Note.
There is other way to do this, you can fix that by going to Control Panel’s Indexing Options > Advanced > Rebuild. But it may take many (many) hours to rebuild…. so I will recommend you to do it overnight.

Source: https://goo.gl/5yjOEH