Fuzzy search on _all field with nested fields

I have an index with records contains many string fields, and one nested field with string and double
i tried to do a multi-match query with fuzzines on the _all field, but it didn't work.
Is there any other solution?

Did you try it on the specific field you want to query?

It doesn't really make sense to run it on _all, because it's almost like an array in how it is structured (even though it actually isn't).