Search Head filter data from Backend

Hello Team, I am in New Splunk, I am have Search head where I am applying Some filter like **index=xyz sourcetype=xyz User=*NYZ*** So this User=*NYZ* filter , i want splunk do it for myself while getting indexed,so basically i want filter index data rather then complete data of users i am filter data to be shown for index XYZ in backend expected output without Filter should be seeen all NYZ Users