Selecting documents with a specific field is set to NULL in Elasticsearch - elasticsearch

Question

Someone please help me to add expires_at IS NULL to ES query below. I looked into Dealing with Null Values section for missing filter but the way I used it (shown at the bottom) causes not expired documents not appearing in result so obviously I'm doing something wrong here.
Note: I don't want to use or query because it is deprecated in 2.0.0-beta1.
QUERY
{
"query": {
"filtered": {
"query": {
"bool": {
"must": [
{
"term": {
"order_id": "123"
}
},
{
"term": {
"is_active": 1
}
},
{
"range": {
"expires_at": {
"gt": "2016-07-01T00:00:00+0000"
}
}
}
]
}
}
}
}
}
This is what I'm aiming at:
SELECT * FROM orders
WHERE
order_id = '123' AND
is_active = '1' AND
(expires_at > '2016-07-01T00:00:00+0000' OR expires_at IS NULL)
This is what I did, but un-expired documents won't show up in this case so this is wrong.
{
"query": {
"filtered": {
"filter": {
"missing": {
"field": "expires_at"
}
},
"query": {
"bool": {
"must": [
......
......
]
}
}
}
}
}
My ES version:
{
"status" : 200,
"name" : "Fan Boy",
"version" : {
"number" : "1.3.4",
"build_hash" : "a70f3ccb52200f8f2c87e9c370c6597448eb3e45",
"build_timestamp" : "2014-09-30T09:07:17Z",
"build_snapshot" : false,
"lucene_version" : "4.9"
},
"tagline" : "You Know, for Search"
}

Answer 1

This should do it:
{
"query": {
"filtered": {
"query": {
"bool": {
"must": [
{
"term": {
"order_id": "123"
}
},
{
"term": {
"is_active": 1
}
},
{
"bool": {
"should": [
{
"range": {
"expires_at": {
"gt": "20160101000000"
}
}
},
{
"filtered": {
"filter": {
"missing": {
"field": "expires_at"
}
}
}
}
]
}
}
]
}
}
}
}
}