def _prepare_data(self, data):
        return data
http://www.elasticsearch.org/guide/reference/query-dsl/query-filter.html
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/Django-1.6.10/django/utils/tree.py/Node._prepare_data--crossover with--dataset/ETHPy150Open ooici/elasticpy/elasticpy/filter.py/ElasticFilter.query