Support for ES5 Query DSL

[jcalonso]

There are some breaking changes on the ES 5 Query DSL that makes this program unusable on new ELK >= 5 stacks: https://www.elastic.co/guide/en/elasticsearch/reference/5.0/breaking_50_search_changes.html

It would be nice to support this new syntax but I dont know how hard its going to be to make it backwards compatible.