The Rebuild LUNA Viewer Index button should only be applied if changes are made to the settings for Who, What, When, Where category fields. Or, if you notice a discrepancy between the data in the LUNA Library and what's appearing in the LUNA Viewer. We recommend doing this during off peak hours.
This can take a significant amount of time, several hours with large collections (50,000)+. As it's rebuilding, the content will slowly start to show up in blocks of 500. Do not rebuild more than one large collection at a time.
To Rebuild LUNA Viewer Index using the Collection Manager, open the Collections tab and select the collection you want to rebuild. Click the Rebuild LUNA Viewer Index at the top of the page.
Next, you will be presented with a dialog box. To continue with the process of rebuilding the LUNA Viewer index click the Refresh button.
The following message will be displayed as the Viewer index is being rebuilt. Click the Close button to exit the dialog box.