Background indexing for Assisted culling and duplicate deletion.

After the installation of LRC 15,4, Lightroom started and full indexing process on my current catalog.
As most of the pictures are on a cloud drive, it takes lot of time and ressources.
 

As I will not use those functionalities on my former folders, is this process needed to use those functionalities on the newly imported folders ?

FYI, LRC already made a full indexing for the culling when I have installed the 15,3 version.

Regards.
Georges.