@Test
    public void canCreateKnowledgeIndexUsingReflection() {
        Model model = Model.builder().build();
        model.getKnowledge(TopDownIndex.class);
    }
This test ensures that the old deprecated behavior of using reflection
to create a KnowledgeIndex is maintained (for now at least).
smithy-model/src/test/java/software/amazon/smithy/model/ModelTest.java