user is not visible in people finder but that user is visible in site in alfresco

[chaituu]

A new user has logged into Alfresco, and joined the new site that we created. I can see that user as a member of that site, but can't find him in People Finder and can't add him to a site from the Administrator dashboard.Is it a indexing problem ?.we are using 4.2.2 version.If its a indexing problem what we need to do?it happened in prod.

[douglascrp]

What you can try to do is to force the reindex of your repository.

You can follow the documentation available at Performing a full reindex with Solr | Alfresco Documentation