Fix Disconnectors error in AD Sync

Those are simply objects filtered by the default rules (think system objects, objects that don't match the sync criteria, etc), or by any additional rules you've created. These are NOT errors, and you can learn more about them here: https://docs.microsoft.com/en-us/azure/active-directory/hybrid/concept-azure-ad-connect-sync-architecture#relationships-between-staging-objects-and-metaverse-objects

If you are troubleshooting an issue with particular object appearing as disconnector, refer to: https://docs.microsoft.com/en-us/azure/active-directory/hybrid/tshoot-connect-object-not-syncing