Exclude certain directories that you don't want them to be scanned in the follow up step (optional)
Built the search database (mandatory, one time)
note:
you have to manually execute this command, because this would take a few seconds for a large project, like the AOSP project;
when files changed a lot in the workspace, files deleted/renamed/added, you might want to re-execute this command again, because the feature of watching files changes and re-indexing them aren't implemented yet, 0_0||.