We have pyWorkPage.CreditCardUID, pyWorkPage.Contact.EmailList().EmailID.
I could form query in below format and, search with CreditCardUID is working fine with pxRetrieveSearchData activity but can't figure out how to search EmailID.

Param.pySearchString = Param.SearchString!=""?"CreditCardUID:\""+Param.SearchString+"\" OR "+Param.SearchString:"true"

Param.pySearchOnProperty = CreditCardUID

How do I include EmailID in my query?

I have configured pySearch for both properties.