USB external drive indexing, Spotlight

[Mac2013orlater]

Mavericks 10.9.5
USB external HDD/SDD drives are used as destination for backups made by Time Machine and 3rd party solutions. There is no the slightest need the volumes on those drives to be indexed by Spotlight.
Therefore exclusion rules have been made in System Preferences > Spotlight > Privacy.
So, the indexing starts on every connect and messes up the storage space.

However the OS forgets all these rules on every eject/unmount of such volume, every pass through to running virtual machine.

Is this a known weakness of Mavericks?
How to fix it?
Do the Mavericks followers behave better?

 

[Fishrrman]

Have you tried opening the "privacy" pane in Spotlight, and dragging the drives in question into it?

I "fixed" problems like this by TURNING OFF Spotlight completely and forever.

I use the free tools "EasyFind" and "Find Any File" when I need to search.
They work as well or better, anyway...