Search alerts have been turned off for this Search Application. For assistance, contact your server administrator

Issue: Whenever users try to setup alerts on the search results you would sometime receive this error “Search alerts have been turned off for this Search Application. For assistance, contact your server administrator” Which means your Search results alerts are not turned on

                                

Resolution:

1) Navigate to Central Administration.

2) Go to Application Management > Manage Service Applications and click on your Search Service.

3) Enable Search Results Alerts

      

This solved my issue.