# Pipelines and nested aggs
**URL:** https://discuss.elastic.co/t/pipelines-and-nested-aggs/95089
**Category:** Elasticsearch
**Created:** [July 30, 2017, 6:56pm UTC](https://discuss.elastic.co/t/pipelines-and-nested-aggs/95089 "2017-07-30T18:56:46Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@PaulieMac](https://discuss.elastic.co/u/PaulieMac)
#### Post date: [July 30, 2017, 6:56pm UTC](https://discuss.elastic.co/t/pipelines-and-nested-aggs/95089/1 "2017-07-30T18:56:46Z")
Hi all,
Anyone know if it is possible to do pipeline aggs when the sibling agg is nested? I always get the following error:
"reason" : "org.elasticsearch.search.aggregations.bucket.nested.InternalNested cannot be cast to org.elasticsearch.search.aggregations.InternalMultiBucketAggregation"
The query and the mapping are quite complex, so I haven't posted them, but will if it helps. I presume it is simply not supported at the moment, but it would be really useful to be able to use pipeline aggs in this way 🙂
I should note - I have posted a second question re copying values from a parent down into it's nested children; that is for a workaround to this issue...
Here is a (much simplified) snippet of the query I have been trying:
```auto
"aggs" : {
"detail" : {
"nested": {
"path": "obs"
},
"aggs": {
"inner_detail" :{
"filters": {
"filters" : [ {
"bool": {
"should": [
{
"term": {
"obs.hr": "17"
}
},
{
"term": {
"obs.hr": "18"
}
}
]
}
} ]
},
"aggs": {
"max": {
"max": {
"field": "obs.tempc"
}
}
}
},
"max": {
"max_bucket": {
"buckets_path": "inner_detail>max"
}
}
}
},
"max": {
"max_bucket": {
"buckets_path": "detail>max"
}
}
}
```
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [August 27, 2017, 6:57pm UTC](https://discuss.elastic.co/t/pipelines-and-nested-aggs/95089/2 "2017-08-27T18:57:13Z")
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