Fetch distinct values in a nested type field in elasticsearch? Can anyone provide one example?

Elastic Stack Elasticsearch
1

{
"aggs" : {
"groupBatches" : {
"nested": {
"path": "admin"
},
"aggs" : {
"batches" : {
"terms" : {"field" : "admin.ids.batchId"}
}
}
}
}
}
This is i got from 1 link but my requirement is same can anybody help me.

2

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