Remove a field from a Elasticsearch document

Question

I need to remove a field in all the documents indexed to Elasticsearch . How can i do it. Will any of the delete queries help me achieve this.

Answer 1

The previous answers doesn't worked for me.

I had to add the keyword "inline":

POST /my_index/_update_by_query
{
  "script": {
    "inline": "ctx._source.remove(\"myfield\")"
  },
  "query" : {
      "exists": { "field": "myfield" }
  }
}