Logstash 6.4.2 to use index pattern for new indices

Hi

I am using Logstash 6.4.2 to read and output data to a new ES 6.4.2 index every day - Each index has the pattern "filebeat-YYYY-MM-DD"

I want the new index to use a specific template

I have added an index template to ES with the following pattern:

PUT /_template/filebeat-geopoint
{
  "order": 0,
  "template": "filebeat-*",
  "settings": {},
  "mappings": {
    "_default_": {
      "properties": {
        "req_gp": {
          "type": "geo_point"
        }
      }
    }
  }
}

(I found the pattern from this SO answer)

I want to configure Logstash so that it uses the pattern above - is the following configuration correct/sufficient?

output {
  elasticsearch {
    hosts => "localhost:9200"
    manage_template => true
    template_name => "filebeat-geopoint"
    template_overwrite => true
    index => "%{[@metadata][beat]}-%{+YYYY.MM.dd}"
    document_type => "doc"
  }
}

I am not sure about the template_overwrite attribute, is this necessary? Is "template_name" sufficient or do I need to specify the template in a .json file as well