How elasticsearch nested query work?

Elastic Stack Elasticsearch
1

I have a document:

{
    "recipes": [
        {
            "name": "prepare",
            "ingredients": ["pork","beef"],
            "steps": [
                {
                    "ingredients": ["pork","beef"]
                }
            ]
        },
        {
            "name": "cook",
            "ingredients": ["olive","garlic","onion","salt"],
            "steps": [
                {
                    "ingredients": ["garlic","onion"]
                },
                {
                    "ingredients": ["olive"]
                },
                {
                    "ingredients": ["salt"]
                }
            ]
        }
    ]
}

and a mapping:

{
    "mappings": {
        "properties": {
            "recipes": {
                "type": "nested",
                "properties": {
                    "name": {
                        "type": "keyword"
                    },
                    "ingredients": {
                        "type": "keyword"
                    },
                    "steps": {
                        "type": "nested",
                        "properties": {
                            "ingredients": {
                                "type": "keyword"
                            }
                        }
                    }
                }
            }
        }
    }
}

I want to ask what the behaviour of the nested query is, if I use a query like this:

{
    "_source": ["*.inner_hits"],
    "query": {
        "nested": {
            "path": "recipes.steps",
            "query": {
                "bool": {
                    "must": [
                        {
                            "term": {
                                "recipes.steps.ingredients": "garlic" (1)
                            }
                        },
                        {
                            "bool": {
                                "must": [
                                    {
                                        "nested": {
                                            "path": "recipes",
                                            "query": {
                                                "bool": {
                                                    "must": [
                                                        {
                                                            "term": {
                                                                "recipes.ingredients": "pork" (2)
                                                            }
                                                        },
                                                        {
                                                            "term": {
                                                                "recipes.ingredients": "beef" (3)
                                                            }
                                                        }
                                                    ]
                                                }
                                            },
                                            "inner_hits": {}
                                        }
                                    }
                                ]
                            }
                        }
                    ]
                }
            },
            "inner_hits": {}
        }
    }
}

The query will return the document above, so it basically get the garlic from the second recipe, first step, i.e. recipes[1]["steps"][0]["ingredients"] , and the pork from the first recipe, i.e. recipes[0]["ingredients"] . But if I switch the (1) to pork , and (2) to garlic and (3) to onion , I expect it also returns the document, but it does not. So, how it really works?

Thank you.

2

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