Querying over nested fields and root fields simultaneously

Elastic Stack Elasticsearch
1

Hi everybody,

I have the following situation:

My index mapping contains:

:string_root_field_1, type: 'string', :index => 'analyzed'
:string_root_field_2, type: 'string', :index => 'analyzed'
indexes :array_nested_field, type: 'nested' do
  :string_nested_field_1, type: 'string', index: 'analyzed'
  :string_nested_field_2, type: 'string', index: 'analyzed'
end

My search clause contains:

query: {
   bool: {
      should: [
            {
                    query_string: {
                                query: 'nnnn rrrr',
                                 field: %w(string_root_field_1, string_root_field_2)
                                 analyzer: 'brazilian',
                                 default_operator: 'AND'
                    }   
            },
            {
                   nested: {
                            path: 'array_nested_field',
                            query: {
                                    query_string: {
                                query: 'nnnn rrrr',
                                 field: %w(string_nested_field_1, string_nested_field_2)
                                 analyzer: 'brazilian',
                                 default_operator: 'AND'
                                     }   
                            }
                   }
             }
      ],
      minimum_should_match: 1,
   }
}

Considering that the default_operator must be AND, and there is an indexed document that contains:

string_root_field_1: rrrr
string_nested_field_1: nnnn

if my query term is

nnnn rrrr,

elastic isn't returing any result.

How can define my query so that I can query over nested fields and root fields simultaneously?

Is that possible?

Thanks in advance,

Guilherme