Hi,
Yes it’s possible within certain limits (no large, incompatible changes in your mapping in particular).
I’m pretty sure this question has already been asked (and answered) here or on stackoverflow, but anyway there’s a tip about that in the documentation (though it’s a bit hidden): Hibernate Search 6.2.2.Final: Reference Documentation
We do plan to provide this as a builtin feature in a future version (don’t ask me when): [HSEARCH-4954] - Hibernate JIRA