I created my own spring-boot 1.4.0.RELEASE based application that used Hibernate 5.2.1.Final and couldn't reproduce the automatic creation of the indices as you described. Looking at the auto configuration logic inside spring boot, it seems this should only happen if you're using Derby, H2, or HSQL as I indicated above. The only other way this would happen is if there is some other outside influence on that particular hibernate setting.

But in doing so, I did identify an issue with PostgreSQL82Dialect (which also includes PostgrisDialect). You can read more about it, HHH-11016 Resolved .