Query DSL - Misunderstanding of filters

Question

I have a query that looks like this:

{
  "query": {
    "constant_score": 
      "filter": {
        "missing": {
          "field": "parent_id"
        }
      }
  }
},
"size": limit,
"from": offset
}

My type has a parent_id and a wall_id field. How can I modify this query so that I can get all types that do not have a parent_id and do not have a wall_id? I can't seem to decipher it from the docs. Thanks for any help offered!

UPDATE

I have the following query that works, but I don't like the catchall query on the title. Is there a way to do this without having to add a "catchall?

{
  "query":{
  "filtered":{
     "query":{
        "field":{ "title":"*" }
     },
     "filter":{
        "and":{
           "filters":[
              {
                 "missing":{ "field":"parent_id" }
              },
              {
                 "missing":{ "field":"wall_id" }
              }
           ]
        }
     }
  }
 }, "size":10, "from":0
}

Answer 1

You're almost there, you just need to use the and filter under your constant_score query:

{
  "query": {
    "constant_score": {
      "filter": {
        "and":[
          { "missing":{ "field":"parent_id" }},
          { "missing":{ "field":"wall_id" }}
        ]
      }
    }
  }
}