mds, mds_stores, and lsd taking up WAY too much memory

[Sarcany]

Could try completely clearing the Spotlight indexes.

Mojave is the last OS you can really do it on.

In the Terminal...

sudo mdutil -a -i off
sudo rm -rf /.Spotlight-V100

Reboot your Mac, then run...

sudo mdutil -a -i on

Give it a few hours to rebuild indexes. Maybe overnight.

Do some searches to confirm that Spotlight is working.

And then check the Memory and CPU usage again.