Following new ES5 doc:
https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-percolate-query.html
says 2 mapping must be defined: doctype, queries
doctype mapping is there to set what fields can be used in percolate query, if I want to be able to use every field available for an index, Can I re-use the index mapping or I need to duplicate the mapping?