final long count = testClient.getDocumentCount("nonexistent_index");
        assertEquals(-1L, count);
    }

    @Test
    public void test_getAliasCount_returnsZeroOnError() {
        // The real getAliasCount returns 0 on error; our test double tracks this
        testClient.aliasCountError = true;
        final int count = testClient.getAliasCount("nonexistent_index");
        assertEquals(0, count);
    }

    }

    @Test(expected = SuggesterException.class)
    public void testDeleteByQueryWithInvalidIndex() {
        // Test delete with non-existent index
        SuggestUtil.deleteByQuery(client, settings, "nonexistent_index", QueryBuilders.matchAllQuery());
    }

    @Test
    public void testDeleteScrollContext() {
        // Test with null scrollId (should not throw exception)