rank_observer.json

{
    "mappings": {
        "properties": {
            "keyword": {
                "type": "keyword"
            },
            "ranking": {
                "type": "integer"
            },
            "target_domain": {
                "type": "keyword"
            },
            "get_date": {
                "type": "date",
                "format": "yyyy/MM/dd"
            }
        }
    }
}