Hello, I am getting following error while ingesting data via Flink

Could not find index for column: gKey, type: FORWARD_INDEX, segment: /tmp/data/pinotServerData/key1_OFFLINE/key1_3_

Schema

{
  "schemaName": "key",
  "dimensionFieldSpecs": [
    {
      "name": "rootKey",
      "dataType": "STRING"
    },
    {
      "name": "gKey",
      "dataType": "STRING"
    }
  ],
  "primaryKeyColumns": [
    "gKey"
  ]
}

Table config

{
  "tableName": "key",
  "tableType": "OFFLINE",
  "isDimTable": true,
  "segmentsConfig": {
    "schemaName": "key",
    "segmentPushType": "REFRESH",
    "replication": "1"
  },
  "tenants": {},
  "tableIndexConfig": {
    "loadMode": "MMAP"
  },
  "metadata": {
    "customConfigs": {}
  },
  "quota": {
    "storage": "200M"
  }
}