方面从弹性搜索中的对象获取所有键 [英] Facet to get all keys from an object in elasticsearch

问题描述

假设我有以下文件：

  {
title：Some Title，
选项：{
key5：1，
key3：0，
key1：1，
} 
}，
 {
title：Some Title，
 options：{
key2：0，
key3：0，
key5 1，
} 
} 
  

我想从 options object using facet。

如果选项是一个简单的数组的键作为字符串，我会简单地使用这样的方面：

 facets：{
options ：{
terms：{
field：options
} 
} 
} 
  / pre> 
 
 
但是在我的情况下不行。
 
 
 
所以如果一个查询返回这两个文档，我应该得到这些键：[key5，key3，key1，key2] 
 
 
 
我实际需要什么样的方面？
解决方案
你不能使用一个方面。 
您有2个选项 -  
 
 
 
保留当前文档结构，并从类型映射中获取密钥列表（请参阅 http://www.elasticsearch.org/引导/ EN / elasticsearch /参考/电流/指数-GET-mapping.html ）。这带来了您遇到的所有字段的类型方案。
 
 
 
 
更改结构。保持键也作为一个字段，所以你的选项数组成为一系列文件，如：
 
 
 
 options：
 
 [
 
 {key：key1，value：1}，
 
 {key：key2，value：0} 
 
]  
 
 
 
你可能想要保留键的上下文 - 搜索或刻面时的值对，将其配置为嵌套类型（ http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/mapping-nested-type.html ）。 
然后，您可以在options.key字段上获取顶部键列表。
 
Let's say I have the following docs:
{
    "title": "Some Title",
    options: {
        "key5": 1,
        "key3": 0,
        "key1": 1,
    }
},
{
    "title": "Some Title",
    options: {
        "key2": 0,
        "key3": 0,
        "key5": 1,
    }
}
I want to get all the keys from options object using facet.

If options was a simple array of keys as strings, I would simple use a facet like this:
"facets" : {
    "options" : {
        "terms" : {
            "field" : "options"
        }
    }
}
But it doesn't work in my case.

So if a query returns those two docs, I should get these keys: ["key5","key3","key1","key2"]

What kind of facet do I actually need?
解决方案
You can't do that using a facet. 
You have 2 options - 

Keep your current document structure and get the list of keys from the type mapping (see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/indices-get-mapping.html). This brings the scheme of your type which holds all the fields encountered.
Change your structure. Keep the key also as a field, so your option array becomes an array of documents like:

"options" :

[

{ "key" : "key1", "value" : 1},

{ "key" : "key2", "value" : 0}

]
You probably will want to keep the context of the key-value pairs when searching or faceting so configure it as a nested type (http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/mapping-nested-type.html).
Then you can facet on the "options.key" field to get a list of top keys.

                        
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