No. 364, Python distributed crawler build search engine Scrapy explaining-elasticsearch (search engine) mapping mapping management

No. 364, Python distributed crawler build search engine Scrapy explaining-elasticsearch (search engine) mapping mapping management

1, mapping (mapping) Introduction

mapping : When creating an index, you can pre-define the type of field and related properties
Elasticsearch guesses the field mappings you want based on the underlying type of the JSON source data, converts the input data into searchable index entries, and mapping is our own defined field data type. Also tells Elasticsearch how to index data and whether it can be searched

role : will make the index establishment more detailed and perfect

type : static mapping and dynamic mapping

2. Built-in mapping type (i.e. data type)

String Type:Text,keyword two kinds
　　text type: participle, extract stemming, create inverted index
　　keyword Type : is an ordinary string that can only be matched to search for

Number type : long,integer,short,byte,double,float

Day type : Date

bool (Boolean) Type : Boolean

Binary (binary) type : Binary

Complex Type:object,nested

Geo (region) type : Geo-point,geo-shape

Professional type : ip,competion

3. Attribute Introduction
Store Properties
Index Property
Null_value Property
Analyzer Properties
Include_in_all Property
Format Property

No. 364, Python distributed crawler build search engine Scrapy explaining-elasticsearch (search engine) mapping mapping management