@Override
    public IndexSpec getIndexSpec(String indexName) {
        return this.indexSpecs.get(indexName);
    }
@Test
    void getIndexSpec() {
        var specs = new DefaultIndexSpecs();
        var nameSpec = primaryKeyIndexSpec(FakeExtension.class);
        specs.add(nameSpec);
        assertThat(specs.getIndexSpec(PrimaryKeySpecUtils.PRIMARY_INDEX_NAME)).isEqualTo(nameSpec);
    }