Is it possible to define the routing in body when Deleting by Query?

So I know we can do this:

DELETE /twitter/tweet/_query?routing=1
{
  "query": { 
    "term": {
      "user": "kimchy"
    }
  }
}

But is it possible to place the routing as part of the body, such as this?:

    DELETE /twitter/tweet/_query
    {
      "query": { 
        "routing": 1,
        "term": {
          "user": "kimchy"
        }
      }
    }

This is a generic Elasticsearch question, so I moved your question there (from the Elastic Cloud forum).

I don't think that's possible.

Here's the routing docs: https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-routing-field.html

However, you should be able to do something close to it using the _msearch-API - put the routing in the search's header.