{
    "properties" : {
        "event" : {
            "properties" : {
                "category" : {
                    "type" : "keyword"
                }
            }
        },
        "@timestamp" : {
            "type" : "date"
        },
        "date" : {
            "type" : "date"
        },
        "date_with_format" : {
            "type" : "date",
            "format" : "yyyy-MM-dd"
        },
        "date_with_multi_format" : {
            "type" : "date",
            "format" : "yyyy-MM-dd || basic_time || year"
        },
        "date_nanos_field" : {
            "type" : "date_nanos"
        }
    }
}