Overlap facets/aggregation

Hello everyone,

I need to calculate a term aggregation with keys that can be included in
another one.

for example, il need to have a facet which gives results like :
"my_facet": {
"buckets": [
{
"key": -1,
"key_as_string": "-1",
"doc_count": 190,
"article_count": {
"doc_count": ...
}
},
{
"key": 6 OR -1,
"key_as_string": "5 OR -1",
"doc_count": 109,
"article_count": {
"doc_count": ...
}
},
{
"key": 5 OR -1,
"key_as_string": "5 OR -1",
"doc_count": 74,
"article_count": {
"doc_count": ...
}
}
]
}

Is it possible ?

(I know that I can do it, if I already know the distinct values of my
buckets, and use differents filtered aggregations for each value but this
is not what I want.)

Thanks for your help
Regards
Armand

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