Creates the specified index
        > search = ElasticSearch()
        > search.index_create('twitter')
          {"ok":true,"acknowledged":true}

def index_create(self, index, number_of_shards=5,number_of_replicas=1):
        '''
        Creates the specified index
        > search = ElasticSearch()
        > search.index_create('twitter')
          {"ok":true,"acknowledged":true}
        '''
        request = self.session
        content = {'settings' : dict(number_of_shards=number_of_shards, number_of_replicas=number_of_replicas)}
        if self.verbose:
            print content
        url = 'http://%s:%s/%s' % (self.host, self.port, index)
        response = request.put(url,content)
        return response