When resolving a user's roles, if there are any roles that depend on DLS/FLS, and that is not permitted by the current license, we skip them.
https://github.com/elastic/elasticsearch/blob/f435488484ec844962d49371b8917c135fe6f714/x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/authz/store/CompositeRolesStore.java#L188-L192

However, we do not perform any logging in this circumstance, and rely on the user discovering that their roles are missing.

We should
1. Add a `WARN` log message
2. Add a Warning header

when this occurs. 
x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authz/store/CompositeRolesStoreTests.java
@SuppressWarnings("unchecked")
            ActionListener<Collection<ApplicationPrivilegeDescriptor>> callback = (ActionListener<
                Collection<ApplicationPrivilegeDescriptor>>) invocationOnMock.getArguments()[2];
            callback.onResponse(Collections.emptyList());
            return null;
        }).when(nativePrivilegeStore).getPrivileges(anySet(), anySet(), anyActionListener());
        final AtomicReference<Collection<RoleDescriptor>> effectiveRoleDescriptors = new AtomicReference<Collection<RoleDescriptor>>();
        final CompositeRolesStore compositeRolesStore = buildCompositeRolesStore(
            SECURITY_ENABLED_SETTINGS,
            fileRolesStore,
            nativeRolesStore,
            reservedRolesStore,
            nativePrivilegeStore,
            null,
            null,
            null,
            null,
            rds -> effectiveRoleDescriptors.set(rds)
        );
        verify(fileRolesStore).addListener(anyConsumer()); 
        final String roleName = randomAlphaOfLengthBetween(1, 10);
        PlainActionFuture<Role> future = new PlainActionFuture<>();
        getRoleForRoleNames(compositeRolesStore, Collections.singleton(roleName), future);
        final Role role = future.actionGet();
        assertThat(effectiveRoleDescriptors.get().isEmpty(), is(true));
        effectiveRoleDescriptors.set(null);
        assertEquals(Role.EMPTY, role);
        verify(reservedRolesStore).accept(eq(Set.of(roleName)), anyActionListener());
        verify(fileRolesStore).accept(eq(Set.of(roleName)), anyActionListener());
        verify(fileRolesStore).roleDescriptors(eq(Set.of(roleName)));