elasticsearch是否将空字符串视为null? [英] Does elasticsearch consider empty string as null?

问题描述

我想知道elasticsearch是否将空字符串视为空值，但是基于下面显示的映射，我看不到它正在这样做.如何让Elasticsearch将空字符串视为 null 并使用 null_value 提供的值进行索引.我的映射如下所示:

I would like to know if elasticsearch considers empty string as null value, but based on my mapping shown below, I don't see that it is doing that. How can I make elasticsearch consider empty string as a null and index using the value provided by null_value. My mapping is shown below:

{
    "mapping": {
        "my_typee": {
            "properties": {
                "autoRank": {
                    "type": "integer",
                    "null_value": 0,
                    "store": true,
                    "index": "analyzed"
                }
            }
        }
    }
}

谢谢.

推荐答案

Elasticsearch不会索引空字符串.在您的情况下，您的字段实际上不是字符串，而是类型的整数.而 null_value 选项实际上就是您想要做的.您无需执行任何其他操作.

Elasticsearch does not index empty strings. In your case your field is actually not string but an integer of type. And null_value option is actually does what you want to do. You dont need to do anything extra.

https://www.elastic.co/guide/zh-CN/elasticsearch/reference/current/null-value.html

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