ruby-on-rails - 在一个环境中使用 Chewy gem 的 Rails 4 应用程序上的 ElasticSearch Fielddata 错误，但在另一个环境中没有

Question

我们有一个 Rails 4 应用程序在两个类似的环境中运行，staging并且production.

最近，这个错误开始出现在本地开发环境和暂存环境中，但在生产环境中没有发生。

Elasticsearch::Transport::Transport::Errors::BadRequest: [400] {
  "error": {
    "root_cause":[{ "type": "illegal_argument_exception",
      "reason":"Fielddata is disabled on text fields by default. 
        Set fielddata=true on [updated_at] in order to load fielddata in memory 
        by uninverting the inverted index. Note that this can however use 
        significant memory. Alternatively use a keyword field instead."}],
      "type":"search_phase_execution_exception",
      "reason":"all shards failed",
      "phase":"query",
      "grouped":true,
      "failed_shards":[{"shard":0,
      "index":"users",
      "node":"xxxxxxxxxxxxxxxxxxxxxxxx",
      "reason":{"type":"illegal_argument_exception",
        "reason":"Fielddata is disabled on text fields by default. 
          Set fielddata=true on [updated_at] in order to load fielddata in memory 
          by uninverting the inverted index. Note that this can however use 
          significant memory. Alternatively use a keyword field instead."}
    }]
  },
  "status":400
}

我知道ElasticSearch 文档解释了如何解决这个错误。但是，我想知道在这些环境中触发错误的原因是什么，因为使用的 ES 配置和查询在登台和生产中是相同的。