Feed json array to Cognitive Search

Hi all,

I do have a very simple json file which I have stored in a blob storage account.
My goal is to index it and eventually search through it.

I think I am missing some basic things here but I just cant figure it out ;)

Here's the json:

{
    "pages": [
        {
            "id": 1,
            "title": "Home",
            "url": "125715.htm",
            "text": "bla bla bla bla"
        },
        {
            "id": 2,
            "title": "Legal Notice",
            "url": "33205.htm",
            "text": "yada yada yada"
        }
    ]
}

The data source is set up and I can see the file.
An indexer is set up and I have changed the key to "id" instead of "metadata_storage_path" as the file is always the same (and therefore not unique) but I am trying to get each json array...

However, when saving, it sits at "validating..." forever. When I just save it with "metadata_storage_path" as key, the indexer is created instantaneously.

Any idea how I can achieve this?

Thanks!