BOM 1.5.8 was using Hibernate 5.2.11 to support search booster but that booster is still not released and has evolved in such a way that it now targets SB 2+. There is therefore no reason to use that Hibernate version. After discussing the issue, it was decided that the version that made more sense was to align with EAP (Hibernate 5.1.10) despite it being a different version than the one defined by Spring Boot 1.5.10 (5.0.12).