Elasticsearch 7.0 - changed date format

Hi.
I think, that I dont get the difference between

  Symbol  Meaning                     Presentation      Examples
  ------  -------                     ------------      -------
   u       year                        year              2004; 04
   y       year-of-era                 year              2004; 04

We used this mapping:

      "date": {
        "type": "date",
        "format": "yyyy-MM-dd HH:mm:ss||yyyy-MM-dd||epoch_millis"
      }

So if I uderstand it correctly, we dont need to change this date format, because it works same on ES 6.8 and 7.x am I right?

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