@Test
public void testItemSearchAsync() throws Exception {

    ItemSearchRequest request = new ItemSearchRequest();
    request.setSearchIndex("Books");
    request.setKeywords("Java");
    Response<ItemSearchResponse> res = requester.itemSearchAsync(request);
    assertNotNull(res);
    ItemSearchResponse response = res.get();
    assertNotNull(response);
    assertNotNull(response.getItems());
    assertTrue(response.getItems().size() > 0);
}