How can I combine multimatch query with a boolquery in elasticsearch? - go

Question

I am trying to write a query that will run a query coupled with a multimatch query (possibly with an empty value) in elasticsearch. Consider the following data example where each item is a document in elasticsearch. Additional fields are redacted to reduce complexity in the example.
[
{
"name": "something",
"categories": ["python", "lib"]
},
{
"name": "test",
"categories": ["python", "lib"]
},
{
"name": "another",
"categories": ["javascript", "lib"]
}
]
What I am trying to do is writing a bool query where categories must match python and lib, and then run a multimatch query on that. So my code structure is:
// assume cat.Filter folds []string{"python", "lib"}
filters := []elastic.Query{}
for _, ff := range cat.Filter {
filters = append(filters, elastic.NewTermQuery("categories", ff))
}
// create multimatch query
e := elastic.NewMultiMatchQuery("something").Fuzziness("2")
// create a query that will match all fields in an array
q := elastic.NewBoolQuery().Must(filters...).Filter(e)
hits, err := client.Search().Index(index).Query(q).Size(limit).Do(ctx)
If I run this query with as is, then I get back 1 hit as expected. But if I change the multimatch query to e := elastic.NewMultiMatchQuery("some"), then I get back an empty array.
What I am trying to accomplish is:
When using e := elastic.NewMultiMatchQuery("some").Fuzziness("2"), return an array of 1 item that matches something
When I set e := elastic.NewMultiMatchQuery("").Fuzziness("2"), return an array of two items that match both categories for python and lib. (this works if i remove the multimatch array filter.
My issue is that I can do either or, but not both. I have a feeling because the Must is enforcing that something has to be an exact match, and some or "" does not match that. Thats what I am trying to overcome. First match all the values in an array, and then query that.