Tags index with logstash and filebeat

I actually use logstash-forwarder and logstash and create a dinamic index with tag with thus configuration:
/etc/logstash/conf.d/10-output.conf

output {
elasticsearch {
hosts => "localhost:9200"
manage_template => false
index => "logstash-%{tags}-%{+YYYY.MM.dd}"
}
}

/etc/logstash-forwarder.conf

"files": [
{
"paths": [
"/var/log/httpd/ssl_access_log",
"/var/log/httpd/ssl_error_log"
],
"fields": { "type": "apache", "tags": "mytag" }
},

I convert the configuration files to filebeat in this way:
/etc/filebeat/filebeat.yml

filebeat:
prospectors:
-
paths:
- /var/log/httpd/access_log
input_type: log
document_type: apache
fields:
tags: mytag

Now in kibana to all index, instead of mytag i see beats_input_codec_plain_applied

Hi
I am facing the same issue.
did you get any solution for this problem?

br,
Sunil

unfortunately still no.....i have to find an alternative with other fields and manage with if to logstash output conf file

I have resolved inserting a filter to logstash:

filter {
    if "beats_input_codec_plain_applied" in [tags] {
        mutate {
            remove_tag => ["beats_input_codec_plain_applied"]
        }
    }
}