Unable to get search results for all users except service account

Symptom

Only Service accounts able to get the search results in SharePoint 2010

Resolution

1. Add Services account and search account into the Pre-Windows 2000 Compatible Access group.

2. Run below Power shell to update configuration
$searchapp = get-spenterprisesearchserviceapplication
$searchapp.SetProperty("ForceClaimACLs",1)