Query to remove null fields from the index

In my index I have data that resembles
Doc 1
"field_1" : "here I am"
"Display_name" : null

Doc 2
"field_1":"I am also here"
"Display_name" : "test"

I am trying to remove the display_name field and value from Doc1.
I would like a query to remove the fields that are Null from the index. I do not want to have to reindex all the data. I am currently using elastic 2.2

any help would be much appreciated.

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