Elasticsearch running aggregate guery - products bought by clients who only buy that product - sql

Question

My docs represents an order in the given format:
{
"name", // the client
"sku" // the product
}
So, suppose the follow data exists:
{ "name": "rudolph", "sku": "apple" }
{ "name": "rudolph", "sku": "apple" }
{ "name": "rudolph", "sku": "apple" }
{ "name": "john", "sku": "banana" }
{ "name": "john", "sku": "banana" }
{ "name": "paul", "sku": "banana" }
{ "name": "paul", "sku": "apple" }
{ "name": "peter", "sku": "banana" }
I can get the clients who bought only 1 kind of item with the query:
{
"aggs": {
"clients": {
"terms": {
"field": "name"
},
"aggs": {
"distinct_sku": {
"cardinality": {
"field": "sku"
}
},
"unique_sku": {
"bucket_selector": {
"buckets_path": {
"qty": "distinct_sku"
},
"script": "params.qty == 1"
}
},
"aggs": {
"terms": {
"field": "sku"
}
}
}
}
},
"size": 0
}
which results
{
...
"aggregations": {
"clients": {
...
"buckets": [
{
"key": "rudolph",
"doc_count": 3,
...
"aggs": {
...
"buckets": [
{
"key": "apple",
"doc_count": 3
}
]
}
},
{
"key": "john",
"doc_count": 2,
...
"aggs": {
...
"buckets": [
{
"key": "banana",
"doc_count": 2
}
]
}
},
{
"key": "peter",
"doc_count": 1,
...
"aggs": {
...
"buckets": [
{
"key": "banana",
"doc_count": 1
}
]
}
}
]
}
}
}
It's possible to manage the query to return how much each item appears in the result?
Something like this:
{
"apple" : 1,
"banana" : 2
}
Thanks in advance.
EDIT
My base has a huge amount of clients and a small quantity of products, so:
Iterate over the above aggregation result to build the wanted result is not an option.
If I have to send a query for each product, It's Ok.