fail("Indexes list should be immutable");
        } catch (UnsupportedOperationException e) {
            // Expected
        }
    }

    @Test
    public void test_withRelevantDocs_manyDocs() {
        List<String> docIds = Arrays.asList("doc1", "doc2", "doc3", "doc4", "doc5", "doc6", "doc7", "doc8", "doc9", "doc10");
        List<Integer> indexes = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);