Question

I have this mapping:

products: {
    product: {
        properties: {
            id: {
                type: "long"
            },
            name: {
                type: "string"
            },
            tags: {
                dynamic: "true",
                properties: {
                    tagId: {
                        type: "long"
                    },
                    tagType: {
                        type: "long"
                    }
                }
            }
        }
    }
}

I want to create a facet on tag ids, but with tag-type filtering.
I need the filter to only apply on the facet and not the query results.
So here’s my request:

{
"from": 0,
"size": 10,
"facets": {
    "tags": {
        "terms": {
            "field": "tags.tagId",
            "size": 10
        },
        "facet_filter": {
            "terms": {
                "tags.tagType": [
                    "11",
                    "19"
                ]
            }
        }
    }
},
"query": {
    "match_all": {}
}

}

The facet filtering does not seem to affect the faceting.
Any ideas?

Answer 1

The filter is applied to the documents, the parent entity in your example. That means that you’re filtering the documents on which you make the facet by tags.tagType. Therefore all documents which have a specific tags.tagType value are used to build the facet, which is not what I want.

This is the usecase for nested documents. You can have a look at this nice article too.