rename field in elastic Search

https://qiita.com/tkprof/items/e50368eb1473497a16d0

How to Rename an Elasticsearch field

• from

    columns:
    - {name: xxx, type: double}

• to

    columns:
    - {name: yyy, type: double}

Pipeline API and reindex

• create a new Pipeline API : Rename Processor

PUT _ingest/pipeline/pipeline_rename_xxx
{
  "description" : "rename xxx",
  "processors" : [
    {
      "rename": {
        "field": "xxx",
        "target_field": "yyy"
      }
    }
  ]
}

{
  "acknowledged": true
}

• then reindex

POST _reindex
{
  "source": {
    "index": "source"
  },
  "dest": {
    "index": "dest",
    "pipeline": "pipeline_rename_xxx"
  }
}