How to make _source field selectable in [available fields]

hi ,I am using kibana 5.5, when adding [available fields] to [selected fileds] ,the _source field gone, _source filed was the original raw string input to elasticsearch, how can I make _source field selectable in [available fields] again.

_source contains the full document that was indexed and is therefore not a field that can be aggregated or filtered on.

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