Mapping, Fielddata and Templates

Mapping is a collection of fields along with a specific data type Fielddata is the field in which the data is stored (requires a specific type - string, float) Template is a template based on which fielddata will be created in a given index.

• Information on all set mappings:\

# curl -XGET -u login:password '127.0.0.1:9200/_mapping?pretty=true'

• Information about all mappings set in the index:\

# curl -XGET -u login:password '127.0.0.1:9200/twitter/_mapping/*?pretty=true'

• Information about the type of a specific field:\

# curl -XGET -u login:password '127.0.0.1:9200/twitter/_mapping/field/message*?pretty=true'

• Information on all set templates:\

# curl -XGET -u login:password '127.0.0.1:9200/_template/*?pretty=true'

• Create - Mapping / Fielddata - It creates index twitter-float and the tweet message field sets to float:

     *`# curl -XPUT -u login:password '127.0.0.1:9200/twitter-float?pretty=true' -d '{`*\
       *`"mappings": {`*\
         *`"tweet": {`*\
           *`"properties": {`*\
             *`"message": {`*\
               *`"type": "float"`*\
             *`}`*\
           *`}`*\
         *`}`*\
       *`}`*\
     *`}'`*
  

  # curl -XGET -u login:password '127.0.0.1:9200/twitter-float/_mapping/field/message?pretty=true'

• Create Template:\

  # curl -XPUT -u login:password '127.0.0.1:9200/_template/template_1' -d'{"template" : "twitter4","order" : 0,"settings" : {"number_of_shards" : 2}}'

# curl -XPOST -u login:password '127.0.0.1:9200/twitter4/tweet?pretty=true' -d'{\

*`"user" : "lab1",`*\
*`"post_date" : "2017-08-25T10:10:00",`*\
*`"message" : "test of ID generation"`*\
*`}'`*

# curl -XGET -u login:password '127.0.0.1:9200/twitter4/_settings?pretty=true'

– Create Template2 - Sets the mapping template for all new indexes specifying that the tweet data, in the field called message, should be of the “string” type:\

*`# curl -XPUT -u login:password '127.0.0.1:9200/_template/template_2' -d'{`*\
  *`"template" : "*",`*\
  *`"mappings": {`*\
    *`"tweet": {`*\
      *`"properties": {`*\
        *`"message": {`*\
          *`"type": "string"`*\
        *`}`*\
      *`}`*\
    *`}`*\
  *`}`*\
*`}'`*

• Delete Mapping - Deleting a specific index mapping (no possibility to delete - you need to index):\

# curl -XDELETE -u login:password '127.0.0.1:9200/twitter2'

• Delete Template:\

# curl -XDELETE -u login:password '127.0.0.1:9200/_template/template_1?pretty=true'