Mapping

tags

Elasticsearch, OpenSearch

summary #

es, ref How Elasticsearch(and full text search) works?, book, evernote

Mapping is the process of defining how a document, and the fields it contains, are stored and indexed. Note: Indexing and storing are two different things: indexing is related to search and storing is related to Database and persistence.

Each document is a collection of fields, which each have their own data type. When mapping your data, you create a mapping definition, which contains a list of fields that are pertinent to the document. A mapping definition also includes metadata fields, like the _source field, which customize how a document’s associated metadata is handled.

Examples #

es, ref

PUT /my-index-000001

  "mappings":
    "properties":
      "age":     "type": "integer" ,
      "email":   "type": "keyword"  ,
      "name":    "type": "text"

PUT /my-index-000001/_mapping

  "properties":
    "employee-id":
      "type": "keyword",
      "index": false

Using mapping to associate an Analyzer with field.