docs: def search_simple(self, index,itype, key, search_term):
          '''
          ElasticSearch.search_simple(index,itype,key,search_term)
          Usage:
          > es = ElasticSearch()
          > es.search_simple('twitter','users','name','kim')
          '''
          request = self.session
          url = 'http://%s:%s/%s/%s/_search?q=%s:%s' % (self.host,self.port,index,itype,key,search_term)
          response = request.get(url)
  
          return response