Difficulty in formulating query for my usecase

Pasting in separate post, as body limit of previous post has been exhausted.

 {
       ...
       
        "_shards": {
           ...
        },
        "hits": {
            "total": 2,
            "max_score": 28.32935,
            "hits": [
                {
                   ...
                    "fields": {
                        "Title": [
                            "Jurassic World"
                        ],
                        "Status": [
                            "NS"
                        ]
                    },
                    "inner_hits": {
                        "inner_hits": {
                            "hits": {
                                "total": 5,
                                "max_score": 25.036417,
                                "hits": [
                                    {
                                        "_index": "in22",
                                        "_type": "event",
                                        "_id": "ET00009709",
                                        "_nested": {
                                            "field": "inner_hits",
                                            "offset": 5
                                        },
                                        "_score": 25.036417,
                                        "_source": {
                                            "Code": "ET00009716",
                                            "IsDefault": "",
                                            "Language": "Bengali",
                                            "Format": "2D",
                                            "Region": "MUMBAI"
                                        }
                                    },
                                    {
                                        "_index": "in22",
                                        "_type": "event",
                                        "_id": "ET00009709",
                                        "_nested": {
                                            "field": "inner_hits",
                                            "offset": 4
                                        },
                                        "_score": 25.036417,
                                        "_source": {
                                            "Code": "ET00009715",
                                            "IsDefault": "",
                                            "Language": "Hindi",
                                            "Format": "3D",
                                            "Region": "MUMBAI"
                                        }
                                    },
                                    {
                                        "_index": "in22",
                                        "_type": "event",
                                        "_id": "ET00009709",
                                        "_nested": {
                                            "field": "inner_hits",
                                            "offset": 3
                                        },
                                        "_score": 25.036417,
                                        "_source": {
                                            "Code": "ET00009714",
                                            "IsDefault": "",
                                            "Language": "Tamil",
                                            "Format": "3D",
                                            "Region": "MUMBAI"
                                        }
                                    }
                                ]
                            }
                        }
                    }
                }
            ]
        }
    }

So I was wondering how to produces all 5 document which matches Region=MUMBAI