ReIndex API throws strict dynamic mapping exception

When I try to re-index the .kibana index; I get an exception for all the documents:
Could someone please help me how to fix this error; since all my dashboards disappeared and have to restore the .kibana index.


POST _reindex
  "source": {
    "index": ".kibana-6"
  "dest": {
    "index": ".kibana"


  "took": 814,
  "timed_out": false,
  "total": 232,
  "updated": 0,
  "created": 4,
  "deleted": 0,
  "batches": 1,
  "version_conflicts": 0,
  "noops": 0,
  "retries": {
    "bulk": 0,
    "search": 0
  "throttled_millis": 0,
  "requests_per_second": -1,
  "throttled_until_millis": 0,
  "failures": [
      "index": ".kibana",
      "type": "doc",
      "id": "doc:visualization:aeb212e0-4c84-11e8-b3d7-01146121b73d",
      "cause": {
        "type": "strict_dynamic_mapping_exception",
        "reason": "mapping set to strict, dynamic introduction of [doc] within [doc] is not allowed"
      "status": 400

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