Collapse on nested inner hits

Elastic Stack Elasticsearch
1

Can you do collapse on inner_hits like this:

{
  "query": {
    "bool": {
      "filter": [
        {
          "nested": {
            "path": "foo",
            "query": {
              "match_all": {}
            },
            "inner_hits": {
              "collapse": {
                "field": "foo.id"
              }
            }
          }
        }
      ]
    }
  }
}

I can't find anything in the docs that says you can do this, but after reading this: https://www.elastic.co/guide/en/elasticsearch/reference/7.6/search-request-body.html#_second_level_of_collapsing I got curious. I can insert the collapse object into inner_hits without getting any errors. Same goes for any values I insert into field. I would expect an error if it wasn't supported, but AFAICT it have no impact.

2

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