Can you also provide some example code. I am trying to reproduce the problem, but the abstract class warning seems unrelated to the exception you are seeing. For example:

//	@Indexed
	public static abstract class AbstractB {

		@DocumentId
		long id;

		@IndexedEmbedded(includePaths = { "foo", "foobars.foo" })
		List<C> list;
	}

	@Indexed
	public static final class B extends AbstractB {
	}

	@Indexed
	public static class C {

		@DocumentId
		long id;

		@Field
		String foo;

		@IndexedEmbedded
		List<C> foobars;
	}

The warning about @indexed on abstract class will depend on whether I add @Indexed to AbstractB. However, the configuration works otherwise. If I, however, rename the path foo to fubar I get the error you describe. However, this path really does not exist.

AFAICT, it is possible to have @IndexedEmbedded in an abstract class, provided the configured paths exist.