Missing filter query still returns the field that should be missing

Elastic Stack Elasticsearch
1

Hi!

I'm using ElasticSearch 1.2.1 and have an index with documents of the type
html-widget. These documents can have (among other things) the property
contentForMobile. I want to list all html-widget documents without the
field contentForMobile. I use this query:

curl -XPOST 'http://my-elastic-host:9200/the-index/html-widget/_search' -d
'{
"query": {
"filtered": {
"filter": {
"bool": {
"must": [
{
"missing": {
"field": "contentForMobile"
}
}
]
}
}
}
}
}'

But this query returns results that do have contentForMobile set (and I'm
not talking about null/empty strings but proper string values). I've also
tried using the query:

{
"query": {
"constant_score": {
"filter": {
"missing": {
"field": "contentForMobile"
}
}
}
}
}

With the same result. The field contentForMobile is mapped like this:

{
"type": "string",
"analyzer": "string_untouched",
"fields": {
"analyzed": {
"type": "string",
"analyzer": "standard"
},
"lower": {
"type": "string",
"analyzer": "string_lowercase"
},
"swedish": {
"type": "string",
"analyzer": "swedish"
},
"sort": {
"type": "string",
"analyzer": "string_sort"
}
}
}

I've also tried the exists filter and I can see that there is a difference
in the result:

Total number of html-widget documents: 434
Documents missing contentForMobile: 165
Documents where contentForMobile exists: 269

All documents returned with the exists query does have the property set but
most documents returned with the missing query also have the property set...

What have I not thought of?

Best regards,
Gabriel Falkenberg

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