How do I force start a index recalculation in version 4.0

In version 4.0 one can easily trigger an index recalculation from the main 'Repository' section. 

In order to manually trigger index recalculation you will need to go to:

 

[UI] --> [Admin tab] --> [Repositories]  --> [Choose the type of repository you are looking for (LocalRemote, or Virtual)] --> [Click on the relevant repository's "Replay" button on the 'Recalculate Index' column].