Additional parameter required for Elasticsearch GET

[HeglerTissot]

Newest Python Elasticsearch API for 6.x looks to be requiring four parameters when calling es.GET to retrieve documents, so I am testing this by changing the method copy_doc from entity_centric_es.py as follows:

297: src_doc = self._es_instance.get(index=src_index, doc_type=src_doc_type, id=src_doc_id, _source=True)

Changes:

• added _source parameter
• src_doc_type = "_all" in the configuration file (doc_copy.src_doc_type property)