elasticsearch按字符串字段的长度过滤 [英] elasticsearch filter by length of a string field

问题描述

我正在尝试获取标题中的记录，而不是X个字符。

i am trying to get records the has in 'title' more then X characters.

注意：并非所有记录都包含标题字段。

NOTE: not all records contains title field.

我尝试过：

GET books/_search
{
    "filter" : {
          "script" : {
              "script" : "_source.title.length() > 10"
          }
      }
}

结果是，我收到此错误：

as a result, i get this error:

GroovyScriptExecutionException[NullPointerException[Cannot invoke method length() on null object

我该如何解决？

推荐答案

您需要考虑到某些文档的<$ c可能为空$ c>标题字段。因此，您可以使用常规的空安全运算符。还要确保改用POST方法：

You need to take into account that some documents might have a null title field. So you can use the groovy null-safe operator. Also make sure to use the POST method instead:

POST books/_search
{
    "filter" : {
          "script" : {
              "script" : "_source.title?.size() > 10"
          }
      }
}

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