SuggestItem[] items = new SuggestItem[0];
        SuggestIndexResponse response = suggester.indexer().index(items);

        assertNotNull(response);
        assertEquals(0, response.getNumberOfInputDocs());
        assertEquals(0, response.getNumberOfSuggestDocs());
        assertFalse(response.hasError());
    }

    @Test
    public void test_indexFromEmptyQueryLogs() throws Exception {

        SuggestIndexResponse response = suggester.indexer().index(item);

        assertNotNull(response);
        assertEquals(1, response.getNumberOfInputDocs());
        assertEquals(1, response.getNumberOfSuggestDocs());
        assertFalse(response.hasError());
    }

    @Test
    public void test_indexMultipleItems() throws Exception {

                        errors.addAll(res.getErrors());
                        numberOfSuggestDocs += res.getNumberOfSuggestDocs();
                        numberOfInputDocs += res.getNumberOfInputDocs();
                        queryLogs.clear();

                        Thread.sleep(requestInterval);
                    }
                }
                deferred.resolve(