Hello

I have the following data

[
    {
        "id": 1,
        "collection": [
            {
                "key": "val1"
            },
            {
                "key": "val2"
            },
            {
                "key": "val3"
            }
        ]
    },
    {
        "id": 2,
        "collection": [
            {
                "key": "val1"
            },
            {
                "key": "val2"
            }
        ]
    }
]

And I would like to be able to get a repartition of the number of items 
into the
“collection” key. For example, With my sample, I expect something like:

   - 1 documents has 3 items 
   - 1 document has 2 items 

And then, after getting this king of information, I would like to be able to
query ES to ask something like “give me all document that have 2 items 
under the
collection property”.

I dig into the documentation, test lot of things with sens, but nothing
give me the expected result.

So I have few questions:

   - Is it possible? 
   - If yes, where can I find the doc? 
   - If no, is it because I did not understand ES correctly? 

Thanks ;)
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