### Author:  [@btiernay](https://discuss.elastic.co/u/btiernay)
#### Post date: [July 24, 2013, 8:03pm UTC](https://discuss.elastic.co/t/nested-match-all-filter-filters-documents-without-nested-documents/12925/1 "2013-07-24T20:03:37Z")
Hi all,
I have a curl example that illustrates my issue:
>
Basically, I would expect that the following 2 queries would always behave
the same:
_(a)_
{
"size":0,
"query":{
"nested":{
"query":{
"match\_all":{}
},
"path":"list"
}
},
"fields":[]
}
_(b)_
{
"size":0,
"query":{
"match\_all":{}
},
"fields":[]
}
However, (a) seems to filter documents without nested docs. Is this the
expected behaviour?
Thank you in advance,
Bob
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### Author:  [@btiernay](https://discuss.elastic.co/u/btiernay)
#### Post date: [July 25, 2013, 12:53pm UTC](https://discuss.elastic.co/t/nested-match-all-filter-filters-documents-without-nested-documents/12925/2 "2013-07-25T12:53:37Z")
After doing some more digging it appears as though this is part of the semantics of how elasticsearch implements nested queries in NestedQueryParser which uses lucene's ToParentBlockJoin:
lucene.apache.org/core/4\_3\_0/join/org/apache/lucene/search/join/package-summary.html
lucene.apache.org/core/4\_3\_0/join/org/apache/lucene/search/join/ToParentBlockJoinQuery.html
I would greatly appreciate a confirmation, but I think an elaboration in the ES docs to mention that it performs "inner join"-like semantics would be very useful to prevent confusion.
Cheers,
Bob
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### Author:  [@mvg](https://discuss.elastic.co/u/mvg)
#### Post date: [July 29, 2013, 9:48am UTC](https://discuss.elastic.co/t/nested-match-all-filter-filters-documents-without-nested-documents/12925/3 "2013-07-29T09:48:17Z")
This is expected behaviour, when using the nested query all documents
without nested inner objects are automatically excluded.
It makes sense to explicitly document this behaviour.
On 25 July 2013 14:53, btiernay [rtiernay@gmail.com](mailto:rtiernay@gmail.com) wrote:
> After doing some more digging it appears as though this is part of the
> semantics of how elasticsearch implements nested queries in
> NestedQueryParser which uses lucene's ToParentBlockJoin:
>
> [org.apache.lucene.search.join (Lucene 4.3.0 API)](http://lucene.apache.org/core/4_3_0/join/org/apache/lucene/search/join/package-summary.html)
>
> [ToParentBlockJoinQuery (Lucene 4.3.0 API)](http://lucene.apache.org/core/4_3_0/join/org/apache/lucene/search/join/ToParentBlockJoinQuery.html)
>
> I would greatly appreciate a confirmation, but I think an elaboration in
> the ES docs to mention that it performs "inner join"-like semantics would
> be very useful to prevent confusion.
>
> Cheers,
>
> Bob
>
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Met vriendelijke groet,
Martijn van Groningen
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### Author:  [@btiernay](https://discuss.elastic.co/u/btiernay)
#### Post date: [August 7, 2013, 12:59pm UTC](https://discuss.elastic.co/t/nested-match-all-filter-filters-documents-without-nested-documents/12925/4 "2013-08-07T12:59:45Z")
Thanks for the confirmation 🙂
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 2:22am UTC](https://discuss.elastic.co/t/nested-match-all-filter-filters-documents-without-nested-documents/12925/5 "2017-07-06T02:22:26Z")