38.mapping Small Example

Key points of knowledge

Preliminary Understanding Mapping

One, prepare the data

Insert a few data to let es automatically create an index for US

Put/website/article/1

{

"Post_date": "2017-01-01",

"title": "My first article",

"Content": "This was my first article in this website",

"author_id": 11400

}

Put/website/article/2

{

"Post_date": "2017-01-02",

"title": "My second article",

"Content": "This was my second article in this website",

"author_id": 11400

}

Put/website/article/3

{

"Post_date": "2017-01-03",

"title": "My third article",

"Content": "This was my third article in this website",

"author_id": 11400

}

Second, try a variety of search, and compare search results

get/website/article/_search?q=2017 3 article Results

get/website/article/_search?q=2017-01-01 3 article Results

get/website/article/_search?q=post_date:2017-01-01 1 article Results

get/website/article/_search?q=post_date:2017 1 article Results

third, view the mapping of type

Get/website/_mapping/article

The results of the implementation are as follows:

{

"Website": {

"Mappings": {

"article": {

"Properties": {

"author_id": {

'type ': ' Long '

},

"Content": {

"Type": "Text",

"Fields": {

"keyword": {

"type": "Keyword",

"Ignore_above": 256

}

}

},

"Post_date": {

' Type ': ' Date '

},

"title": {

"Type": "Text",

"Fields": {

"keyword": {

"type": "Keyword",

"Ignore_above": 256

}

}

}

}

}

}

}

}

from the results can be seen es index type A data structure and its associated configuration, The abbreviation is mapping

1 , dynamic mapping index type and type mapping mapping field corresponding data types, and how to set the word breaker

2 , manually-created Mapping, You can also manually create the data before you create it Index and the type , as well type corresponding to the Mapping .

Iv. Why the search results are inconsistent

because es Automatic Setup Mapping the time, for the different Field set up a different Data Type . Different data types, such as word breakers, search, and other behaviors are not the same. So there's a _all field and post_date field search performance is completely different.

38.mapping Small Example