'Returns items that satisfy the search criteria, including one or more search
indices.
For a full list of search terms,
:see: http://docs.amazonwebservices.com/AWSECommerceService/2010-09-01/DG/index.html?ItemSearch.html'

def item_search(self, search_index, **params):

    params['SearchIndex'] = search_index
    return self.get_response('ItemSearch', params)
