Random score on nested query with inner hits

Elastic Stack Elasticsearch
1

I am having trouble getting a random set of documents when performing a nested query with inner_hits. I need the documents to be random, not the inner hits themselves.

Here's the mapping for the examples:

{
    "mappings": {
        "doc": {
            "properties": {
                "faces": {
                    "type": "nested",
                    "properties": {
                        "cluster_id": {
                            "type": "integer"
                        }
                    }
                }
            }
        }
    }
}

Now, just as a sanity check, the following query returns a random set of documents:

{
    "query": {
        "function_score": {
            "random_score": {},
            "query": {
                "match_all": {}
            }
        }
    }
}

But now if I try to modify that to return the inner hits for a specific cluster id, then the results are not random anymore. Here's the query:

{
    "query": {
        "function_score": {
            "random_score": {},
            "query": {
                "nested": {
                    "path": "faces",
                    "query": {
                        "bool": {
                            "filter": [
                                {
                                    "term": {
                                        "faces.cluster_id": 0
                                    }
                                }
                            ]
                        }
                    },
                    "inner_hits": {}
                }
            }
        }
    }
}

I have also tried wrapping the query bit of the nested query in the function_score, but the results are the same, no random ordering.

Any help is greatly appreciated!

2

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