def __getitem__(self, index):
http://www.elasticsearch.org/guide/reference/query-dsl/limit-filter.html
dataset/ETHPy150Open ardekantur/pyglet/pyglet/text/runlist.py/AbstractRunIterator.__getitem__--crossover with--dataset/ETHPy150Open ooici/elasticpy/elasticpy/filter.py/ElasticFilter.limit