Ошибка с обновлением схемы Api - Google cloud search

Question

В настоящее время я работаю с Google Cloud Search REST Api, когда я пытаюсь обновить свою схему, я получаю следующую ошибку.Может ли кто-нибудь объяснить, почему?

 {
  "error": {
    "code": 400,
    "message": "Disallowed schema change for previously deleted property: Cannot change is_repeated from true to false. Disallowed schema change for previously deleted property: Cannot change the retrieval importance of a text property.",
    "status": "INVALID_ARGUMENT",
    "details": [
      {
        "@type": "type.googleapis.com/google.rpc.BadRequest",
        "fieldViolations": [
          {
            "field": "google.apps.search.v1.film.titolo",
            "description": "Disallowed schema change for previously deleted property: Cannot change is_repeated from true to false."
          },
          {
            "field": "google.apps.search.v1.film.titolo",
            "description": "Disallowed schema change for previously deleted property: Cannot change the retrieval importance of a text property."
          }
        ]
      }
    ]
  }
}