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

问题描述

我正在尝试获取标题"中超过 X 个字符的记录.

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.

我已经尝试过:

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

结果，我收到此错误:

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可能具有空 title 字段.因此，您可以使用 groovy 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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