Support _source_includes / _source_excludes parameter as of ES 6.6

[hupfis]

As of version 6.6 Elasticsearch deprecated _source_include in favor of _source_includes, see https://www.elastic.co/guide/en/elasticsearch/reference/6.6/breaking-changes-6.6.html

Similarly for _source_exclude/_source_excludes

[fxdgear]

Closing now. 7.0.1 has updated all the query params