{
    "properties" : {
        "dep" : {
            "type" : "nested",
            "properties" : {
                "dep_name" : {
                    "type" : "text"
                },
                "dep_no" : {
                    "type" : "text",
                    "fields" : {
                        "keyword" : {
                            "type" : "keyword"
                        }
                    }
                },
                "end_date" : {
                    "type" : "date"
                },
                "start_date" : {
                    "type" : "date"
                }
            }
        }
    }
}