Data structure under 44.mapping

Key points of knowledge

1 , understanding the data types of the ES core

2 , understand ES default mapping way

3 , view Mapping

1 , the core data type

• string ,text Span style= "Font-family:dejavu Sans Mono" >
• byte
• short integer long float double
• boolean
• date

    

2 , Dynamic Mapping

This is ES comes with (the default mapping mode), which is mapping by default in cases where the programmer is not specified.

True or false--and Boolean

123--long

123.45--Double

2017-01-01--Date

"Hello World"--string/text

3 , view Mapping

Syntax: Get/index/_mapping/type

Example: Get/test_index/_mapping/test_type

The results are as follows

{

"Test_index": {

"Mappings": {

"Test_type": {

"Properties": {

"Test_field": {

"Type": "Text",

"Fields": {

"keyword": {

"Type": "Keyword",

"Ignore_above": 256

}

}

},

"Test_field1": {

"Type": "Text",

"Fields": {

"keyword": {

"Type": "Keyword",

"Ignore_above": 256

}

}

},

"Test_field2": {

"Type": "Text",

"Fields": {

"keyword": {

"Type": "Keyword",

"Ignore_above": 256

}

}

}

}

}

}

}

}

Data structure under 44.mapping