For instance:

	@Entity
	@Indexed
	private static class A {
		@Id
		@GeneratedValue
		private Long id;

		@Field(analyze = Analyze.NO)
		private String foo;
	}

	@Entity
	private static class B {
		@Id
		@GeneratedValue
		private Long id;

		@OneToOne
		@IndexedEmbedded(includePaths = "foo") // Include only "a.foo"
		private A a;
	}

	@Entity
	@Indexed
	private static class C {
		@Id
		@GeneratedValue
		private Long id;

		@OneToOne
		@IndexedEmbedded // Include every field of "b"
		private B b;
	}

This will not include b.a.foo in the resulting document for C, even though we would think so (since the @IndexedEmbedded in C doesn't mention any restriction on what to embed).

The reason is, we only take into account the top-level "includePaths", and if it's empty, we interpret that as "don't include anything" in embedded entities...

The issue can be worked around by specifying explicitly the paths to include on C.b.

Note that this issue is here since 5.5.0.Final at least (I didn't check previous versions).