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Hey Jetin, I'm not able to test this but the documentation seems to point to an additional section in your ingestion spec JSON that looks like this;

"transformSpec": {
      "transforms": [
        {
          "type": "expression",
          "name": "epochSeconds",
          "expression": "FLOOR(__time / 1000)"
        }
      ]
    }

that

transformSpec

looks to be a 1st level key in the ingestion spec, you can probably add it after the

dataSchema

section.