I'm not sure what a "non-enhanced" sequence is, sorry, but the test is vanilla JPA with very minimal annotations:

• entity1: https://github.com/hibernate/hibernate-search/blob/c06e4fe5fbc6b5a09195f40d760a093691f2c7f2/orm/src/test/java/org/hibernate/search/test/configuration/Address.java
• entity1: https://github.com/hibernate/hibernate-search/blob/c06e4fe5fbc6b5a09195f40d760a093691f2c7f2/orm/src/test/java/org/hibernate/search/test/configuration/Country.java

In case you want to reproduce it:

• testcase to reproduce: https://github.com/hibernate/hibernate-search/blob/c06e4fe5fbc6b5a09195f40d760a093691f2c7f2/orm/src/test/java/org/hibernate/search/test/configuration/IndexEmbeddedProgrammaticallyMappedTest.java

There is an error on schema creation:

ERROR SchemaExport:484 - ERROR: relation "hibernate_sequence" already exists

And one on schema drop:

ERROR SchemaExport:484 - ERROR: sequence "hibernate_sequence" does not exist