@Test
    public void test_query_returnsThis() {
        final IndexExportJob result = indexExportJob.query(QueryBuilders.matchAllQuery());
        assertSame(indexExportJob, result);
    }

    @Test
    public void test_query_acceptsNull() {
        final IndexExportJob result = indexExportJob.query(null);
        assertSame(indexExportJob, result);
    }

    // --- execute() tests ---

    @Test