elasticsearch/docs/reference/mapping/params/index.asciidoc

[[mapping-index]]
=== `index`

The `index` option controls whether field values are indexed. It accepts `true`
or `false`. Fields that are not indexed are not queryable.

NOTE: For the legacy mapping type <<string,`string`>> the `index` option only accepts legacy values `analyzed` (default, treat as full-text field), `not_analyzed` (treat as keyword field) and `no`.