Elasticsearch has a _source field [1] that stores the entire original document and is enabled by default. It's required to support features like highlighting in

Elasticsearch has a _source field [1] that stores the entire original document and is enabled by default. It's required to support features like highlighting in results. ES also has a reindex API that specifically makes use of this [2]. 1. https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-source-field.html https://www.elastic.co/guide/en/elasticsearch/reference/curr... 2. https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-reindex.html https://www.elastic.co/guide/en/elasticsearch/reference/curr...