i'm looking for a way to add only the members of a specific Ldap group (In Active Directory) instead of all my ldap users. i try different way and all users are always added in the fisheye repository.
Try using "User Object Filter" filter in Admin / User Settings / User Directories / Configure LDAP User Directory / User Schema Settings.
As documented in https://confluence.atlassian.com/fisheye/connecting-to-an-existing-ldap-directory-812223034.html#ConnectingtoanexistingLDAPdirectory-Userschemasettings and https://confluence.atlassian.com/dev/confluence-ldap-documentation-index/adding-ldap-integration-to-confluence-2-1-x/how-to-write-ldap-search-filters this can be used to apply extra filters to the users. You will also find similar Group Object Filter field to apply extra filters to the LDAP groups.
Hope that helps