es 6.8.18 创建索引指定timestamp：

PUT my_index
{
"mappings": {
"_doc": {
"properties": {
"createTime": {
"type": "date",
"format": "yyyy-MM-dd HH:mm:ss"
},
"updateTime": {
"type": "date",
"format": "yyyy-MM-dd HH:mm:ss"
}
}
}
}
}