I am a Ph.D. student at a top 15 program in my current social science field, I'll call it field X. My research is interdisciplinary standing at the intersection of field X and another field Y.
I genuinely like graduate school and my work here, but as I've developed as a scholar, it has become apparent that my true passion (and resultant new research questions) lies clearly in field Y. How frowned upon would it be to master out of my program in field X and try to move to field Y? I've heard mastering out of a Ph.D. program is a huge red flag when reapplying, and I think I'd enjoy a future in field X more than any other job save for a future in field Y. I also feel very indebted to my current program and advisors as a result of the resources they've invested in me.
Would it be advisable to give up on a future in field Y and remain in field X? Or would moving not be so terrible since it's due to a genuine (slight) change in research interests rather than not liking graduate school, or clashing with advisors, or anything like that?