Finder Search Can't Find Existing Files Anymore.

Resetting the Spotlight index on macOS can help resolve issues related to search functionality and indexing errors. To reset the Spotlight index, you can follow these steps:

1. Open Terminal: You can find the Terminal application in the Utilities folder within the Applications folder, or you can use Spotlight to search for it.

2. Type the following command and press Enter:

sudo mdutil -E /

This command tells macOS to erase (reset) the Spotlight index for the entire file system. You will be prompted to enter your administrator password, as this command requires superuser privileges. Type your password and press Enter.

3. The system will start reindexing your files, which may take some time, depending on the size of your storage and the number of files. You'll see messages like "Indexing enabled" and a progress indicator.

4. Once the indexing is complete, you should see a message like "Indexing enabled." This means the index has been reset, and Spotlight will now start reindexing your files.

5. You can check the indexing progress by using the `mdutil` command with the `-s` option:

mdutil -s /

This will display the indexing status for your root directory.

Please be patient while Spotlight rebuilds the index. The time it takes can vary depending on the number of files and the speed of your storage.

After the index has been reset and rebuilt, you should find that Spotlight searches work properly again.