Field not aggregatable!

I have my elastic search index mapping as follows

{
    "mappings": {
        "nginx_logs": {
            "properties": {
                 "request": {
                    "type": "text",
                    "fields": {
                        "keyword": {
                            "type": "keyword"
                        }
                    }
                }
             }
        }
    }
}

But when I am looking into my kibana management, request field is not creating any aggregatable field.

please help me guys !!!!!!

Kibana stores a copy of mappings, and occasionally they get out of date if mappings are updated. Does clicking on the refresh icon in the top right help?