Anybody tried migration from Claim-based authentication to ADFS successfully in SharePoint 2013 before...
How to handle to user account migration between claim-based and ADFS?
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There are two ways to accomplish this:
Convert-SPWebApplication. An example, including other information you may find helpful, is available on the KB article The Convert-SPWebApplication command cannot convert from Windows claims to SAML in SharePoint Server 2013.
Move-SPUser is another option. The migration path would be like this:
$user = Get-SPUser -Identity 'i:0#.w|domain\jdoe' -Web https://siteUrl Move-SPUser -Identity $user -NewAlias 'i:firstname.lastname@example.org' -IgnoreSid
Substitute the claim identifier, issuer, and identity appropriately.
Move-SPUser is farm-wide.