At this time there is a tag private on this type of contents to not found this content in the regular search engine in back-office

<cms:tags>
            <cms:tag>private</cms:tag>
        </cms:tags>

But the search engine service does not list the the private contents.

The goal is to select this content to be able to select its metadata, for example to search on the last name of the user.

Do we need a specific search engine like on ODF plugin ?
Do we need allow using private contents in the search engine service ?
....?

This is very important because we are unable to setup a search engine of users on the index ou anywhere else!