Elasticsearch可搜索的合成字段 [英] Elasticsearch searchable synthetic fields
问题描述
假设在源文档(JSON)中存在几个名为 a
和 b
的字段,类型为 long
的代码,我想构造一个合成字段(例如 c
)通过将下一个字段的值与下划线连接起来,将其索引为关键字
.
Provided that in a source document (JSON) exist a couple of fields named, a
and b
,
that are of type long
, I would like to construct a synthetic field (e.g. c
)
by concatenating the values of the previous fields with an underscore and
index it as keyword
.
也就是说,我正在研究一种可以通过虚构的,部分的映射支持的功能,如下所示:
That is, I am looking into a feature that could be supported with an imaginary, partial, mapping like this:
...
"a": { "type": "long" },
"b": { "type": "long" },
"c": {
"type": "keyword"
"expression": "${a}_${b}"
},
...
注意:上面的映射只是出于示例的目的.这是无效的!
NOTE: The mapping above was made up just for the sake of the example. It is NOT valid!
所以我要寻找的是弹性搜索中是否有功能,要支持的配方或提示这个要求.无需在 _source
中注册该字段,只需进行搜索即可.
So what I am looking for, is if there is a feature in elasticsearch, a recipe or hint to support
this requirement. The field need not be registered in _source
, just need to be searchable.
推荐答案
有两个步骤- ingest_pipeline
.
There are 2 steps to this -- a dynamic_mapping
and an ingest_pipeline
.
I'm assuming your field c
is non-trivial so you may want to match that field in a dynamic template using a match
and assign the keyword
mapping to it:
PUT synthetic
{
"mappings": {
"dynamic_templates": [
{
"c_like_field": {
"match_mapping_type": "string",
"match": "c*",
"mapping": {
"type": "keyword"
}
}
}
],
"properties": {
"a": {
"type": "long"
},
"b": {
"type": "long"
}
}
}
}
然后,您可以建立一个管道,该管道将连接您的 a
& b
:
Then you can set up a pipeline which'll concatenate your a
& b
:
PUT _ingest/pipeline/combined_ab
{
"description" : "Concatenates fields a & b",
"processors" : [
{
"set" : {
"field": "c",
"value": "{{_source.a}}_{{_source.b}}"
}
}
]
}
在提取新文档后(使用已激活的管道!)
After ingesting a new doc (with the activated pipeline!)
POST synthetic/_doc?pipeline=combined_ab
{
"a": 531351351351,
"b": 251531313213
}
我们很乐意:
GET synthetic/_search
收益
{
"a":531351351351,
"b":251531313213,
"c":"531351351351_251531313213"
}
也通过w/ GET合成/_mapping
进行验证.
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