How to create auto generated ids while reindexing?

Elastic Stack Elasticsearch
3

I am linking my old post of same
Try

POST _reindex
{
  "source": {
    "index": ["twitter", "twitter2"]
  },
  "dest": {
    "index": "new_twitter"
  },
  "script": {
    "source": "ctx._id=null",
    "lang": "painless"
  }
}
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