# Elasticsearch aggregation query ignores parent filter when setting min\_doc\_count to 0 in child terms aggregation
**URL:** https://discuss.elastic.co/t/elasticsearch-aggregation-query-ignores-parent-filter-when-setting-min-doc-count-to-0-in-child-terms-aggregation/174434
**Category:** Elasticsearch
**Created:** [March 28, 2019, 9:14pm UTC](https://discuss.elastic.co/t/elasticsearch-aggregation-query-ignores-parent-filter-when-setting-min-doc-count-to-0-in-child-terms-aggregation/174434 "2019-03-28T21:14:11Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@m5tt](https://discuss.elastic.co/u/m5tt)
#### Post date: [March 28, 2019, 9:14pm UTC](https://discuss.elastic.co/t/elasticsearch-aggregation-query-ignores-parent-filter-when-setting-min-doc-count-to-0-in-child-terms-aggregation/174434/1 "2019-03-28T21:14:12Z")
If i run this query in Elasticsearch, it returns a bucket set aggregating on field `name`. Not returning any document that has a `type` field of **1** This is correct.
```auto
{:size=>0,
:aggs=>
{:agg=>
{:filter=>{:term=>{"type"=>1}},
:aggs=>{:agg=>{:terms=>{:field=>"name", :min_doc_count=>1}}}}}}
```
Now if i run this exact same query, changing _only_ `min_doc_count` to **0**. Then it _ignores_ the parent filter aggregation and returns _all_ documents, regardless of type.
```auto
{:size=>0,
:aggs=>
{:agg=>
{:filter=>{:term=>{"type"=>1}},
:aggs=>{:agg=>{:terms=>{:field=>"name", :min_doc_count=>0}}}}}}
```
If i reverse the query, ie the filter aggregation nested inside the terms, then it doesnt work regardless of the `min_doc_count` setting.
I understand this is documented [Here:](https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-terms-aggregation.html)
> Setting `min_doc_count` = `0` will also return buckets for terms that didn’t match any hit. However, some of the returned terms which have a document count of zero might only belong to deleted documents or documents from other types, so there is no warranty that a `match_all` query would find a positive document count for those terms.
**However there _must_ be a way to build a aggregation query that returns documents with a doc\_count 0 which are _also_ filtered by a filter aggregation.**
I am using Elasticsearch 6.x, and using it through the Elasticsearch Rails gem.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [April 25, 2019, 9:14pm UTC](https://discuss.elastic.co/t/elasticsearch-aggregation-query-ignores-parent-filter-when-setting-min-doc-count-to-0-in-child-terms-aggregation/174434/2 "2019-04-25T21:14:23Z")
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