我正在尝试更改opensearch中string字段的格式：

PUT my_index/_mapping
{
  "mappings": {
    "properties": {
      "timestamp": {
        "type": "date",
        "format": "YYYY-MM-DD HH:mm:ss.SSS"
      }
    }
  }
}

回答是

{
  "error" : {
    "root_cause" : [
      {
        "type" : "mapper_parsing_exception",
        "reason" : "Root mapping definition has unsupported parameters:  [mappings : {properties={timestamp={format=YYYY-MM-DD HH:mm:ss.SSS, type=date}}}]"
      }
    ],
    "type" : "mapper_parsing_exception",
    "reason" : "Root mapping definition has unsupported parameters:  [mappings : {properties={timestamp={format=YYYY-MM-DD HH:mm:ss.SSS, type=date}}}]"
  },
  "status" : 400
}

我花了几天时间试图弄清楚这一点，在我看来，开放搜索只是如此不必要的复杂。