Spotlight not working on macOS Ventura.

You've install the Antivirus One app. It is not needed. You have Malwarebytes installed and that is more than enough to protect you from malware and adware. Uninstall Antivirus One according to the developer's instructions.

Give this a try: boot into Safe Mode according to How to use safe mode on your Mac and reboot normally. Then try rebuilding the Spotight index again.

NOTE 1: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following; 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files

NOTE 2: if you have a wireless keyboard with rechargeable batteries connect it with its charging cable before booting into Safe Mode. This makes it act as a wired keyboard as will insure a successful boot into Safe Mode.

Try resetting the Spotlight index.

Open Terminal, and paste the following line

sudo mdutil -E /

enter your password (there is no feedback as you type) and press enter.

Then there may be something else... an antivirus perhaps?

Please run Etrecheck and post its full report here. Use the "additional text" button and paste the report into the text box.

You seem to have been upgrading in place since at least 2014.

There are a number of old things that may or may not work correctly in Sonoma.

I'd make sure to have a full up to date backup, then use Recovery to erase and install a clean version of Sonoma; then finally migrate ONLY the user accounts from the backup.

Been having this same issue for a while now – literally just fixed it on my Macbook M1 Pro a couple minutes ago and it works fine once again (FINALLY)!

As @Luis Sequeiera1 recommended up above:

Open Terminal, and paste the following line

sudo mdutil -E /

enter your password (there is no feedback as you type) and press enter.

After doing this, I noticed Terminal returned "Indexing disabled".

From there, I typed in the following and pressed enter. This re-enabled the indexing.

sudo mdutil -i on /

At this point, I re-ran "sudo mdutil -E /" in Terminal and it returned "Indexing enabled" and I confirmed Spotlight began working almost immediately.

Hope this helps!