关键字类型如何在弹性搜索中存储和分析
根据我的理解，关键字类型将不会被分析并作为确切的术语存储。例如，“关闭”将被存储在弹性搜索中的“关闭”中，而文本类型将使用默认或自定义分析仪（如果指定）进行分析，并将“关闭”分开为[关闭，向下]分为两个单词和将其存储在ES中。这也适用于搜索。为了搜索关键字类型的字段，我们必须搜索其确切的术语，而搜索文本类型字段，我们可以搜索实际文本中存在的任何一个或多个术语。
我有一个名为sample_index的索引，该索引具有两个字段 - 类型关键字的描述和类型文本的消息
这是索引的映射，名为sample_index
查询
POST sample_index/_search
{
"query": {
"query_string": {
"query": "keyword"
}
}
}
这是上述查询的输出：
在这里您可以在搜索描述字段中存在的单词“关键字”（关键字类型）中，结果显示。但是根据我的理解，这是不可能的吧？因为对于关键字类型，整个文本的索引都没有被分开。我的理解怎么可能是可能的？
ES版本：5.6.4
As per my understanding, Keyword type will not be analyzed and be stored as an exact term. For example "shut down" will get stored as "shut down" in elastic search whereas text type will analyze using default or custom analyzer(if specified) and it'll separate "shut down" as [shut , down] into two words and store it in ES. This applies for searching also. For searching a field which is of keyword type we have to search for it's exact term while for search a field of text type we can search any one or more of the terms present in the actual text.
I've an index named sample_index which has two fields - description of type keyword and message of type text
This is the mapping of the index named sample_index
Query
POST sample_index/_search
{
"query": {
"query_string": {
"query": "keyword"
}
}
}
This is the output of the above query:
Here you can see that upon searching the word "keyword" which is present in description field (which is of keyword type), the results show up. But as per my understanding this is not possible right? because for keyword type , the whole text get's indexed as it is without getting split. How can this be possible or is something wrong with my understanding?
ES Version: 5.6.4
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tldr;
在版本
5.6使用 query_string 。如果未选择
default_field，它将转到_ALL字段。_所有字段文档中的所有字段。
这就是为什么你有这样的结果
Tldr;
In version
5.6when using a query_string.If no
default_fieldis selected, it will turn to_allfield.The _all field is a concatenation of all the fields in the document.
This is why you have such a results
您的
消息实际上是类型文本。此外，您还有一个类型
关键字的字段 message ，但与您的搜索查询无关。因为您正在使用
query_string，默认情况下在所有字段上搜索，因此您的搜索查询将与您的Message> Message> Message> typetext> text> text 。这就是为什么您能够搜索“关键字”一词的原因，因为text类型被分析。来自 query_string 文档
fields 文档
Your
messageis actually of typetext.Additionally, you have a
fieldof typekeywordonmessage, but not relevant for your search query.Because you're using
query_string, which searches on all fields by default, your search query will match the "keyword" word in yourmessageof typetext. This is why you're able to search for the word "keyword", becausetexttypes get analyzed.From query_string documentation
Fields documentation