[ES from entry to actual combat] 18. Full-text search-ElasticSearch-mapping-mapping creation

Continue from section 17

3、Mapping

1), field type

• Core type

  • String
    text,keyword
  • Digital type (Numeric)
    long, integer, short, byte, double, float, half_float,scaled_float
  • Date type (Date)
    date
  • Boolean
    boolean
  • Binary type
    binary

• Compound type

  • Array type (Array)
    Arraysupport is not for specific data types
  • Object type (Object)
    objectAn object used for a single JSON object
  • Nested type (Nested)
    nestedfor arrays of JSON objects

• Geographical type (Geo)

  • Geographical coordinates (Geo-point)
    geo_pointlatitude/longitude coordinates
  • Geo-shape is
    geo_shapeused for complex shapes such as polygons

• Specific type

  • IP type (IP) is
    ipused to describe IPv4 and IPv6 addresses
  • Completion type (Completion)
    completionprovides automatic completion prompt
  • Token count type is
    token_countused to count the number of entries in a string
  • Accessory Type (attachment)
    Reference mapper-attachments plugin supports attachments such as Microsoft Office format, open document format, ePub, HTML and other index attachmentdata type.
  • The extraction type (Percolator)
    accepts query-dslqueries from a domain-specific language ( )

For more field types, please refer to the official ES document: reference document-mapping-types

2), mapping

Mapping (mapping)
Mapping 是用来定义一个文档(document)，以及它所包含的属性(field)是如何存储和索引的. For example, use mapping to define:

• Which string attributes should be considered as full text fields

• Which attributes contain numbers, dates or geographic locations

• Whether all attributes in the document can be indexed (_all configuration)

• Date format

• Custom mapping rules to perform dynamic addition of attributes

• View mapping information:
  GET bank/_mapping
  

• Modify the mapping information:

  • Create index

PUT /my-index
{
    
    
  "mappings": {
    
    //映射规则
    "properties": {
    
    
      "age":    {
    
     "type": "integer" },  
      "email":  {
    
     "type": "keyword"  },//keyword不会进行全文检索 
      "name":   {
    
     "type": "text"  }//text保存的时候进行分词，搜索的时候进行全文检索   
    }
  }
}

ES automatically guessed the mapping type:

JSON type	Domain type
Boolean: true, false	boolean
Integer: 123	long
Floating point number: 1.23	double
String, valid date 2020-02-02	date
String, foo bar	string
Objects, also known as hashes, store object types	object

Reference document-mapping

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reference:

Elasticsearch Reference

elastic

Getting started with the full-text search engine Elasticsearch