python - Elasticsearch:对索引数据应用小写

我在我的Elasticsearch中已为文档建立索引。示例文档如下所示:

{
    "_index": "processed_tweets",
    "_type": "processed",
    "_id": "830403820580663296",
    "_score": 1,
    "_source": {
      "at": [
        "@LouisDasch"
      ],
      "original_tweet_id": "830398288352403457",
      "id_str": "830403820580663296",
      "trigrams": [
        "blessed lourdes lady",
        "lourdes lady feast",
        "lady feast day",
        "feast day wishing"
      ],
      "hashtags": [
        "#Catholic"
      ],
      "id_tweet_creator": "487735029",
      "tokens": [
        "blessed",
        "lourdes",
        "lady",
        "feast",
        "day",
        "wishing"
      ],
      "bigrams": [
        "blessed lourdes",
        "lourdes lady",
        "lady feast",
        "feast day",
        "day wishing"
      ],
      "retweeted": true
    }
  }

我想将我已建立索引的所有文档的“hashtags”字段中存在的所有hashtags小写。
例如，我将有:
“hashtags”:[“#Catholic”]->“hashtags”:[“#catholic”]
将每个关键字更新为等同于小写字母的最佳方法(节省时间)是什么(保留“＃”)？

最佳答案

如果您使用的是ES 5.0及更高版本，则会引入一种称为“无痛”的脚本语言。这可以帮助您更新字段。它的处理速度非常快。

检查下面的链接以获取更多信息。

https://www.elastic.co/guide/en/elasticsearch/reference/5.0/modules-scripting-painless.html