index_prefixes

The index_prefixes parameter enables the indexing of term prefixes to speed up prefix searches. It accepts the following optional settings:

min_chars

The minimum prefix length to index. Must be greater than 0, and defaults to 2. The value is inclusive.

max_chars

The maximum prefix length to index. Must be less than 20, and defaults to 5. The value is inclusive.

This example creates a text field using the default prefix length settings:

  1. PUT my-index-000001
  2. {
  3.   "mappings": {
  4.     "properties": {
  5.       "body_text": {
  6.         "type": "text",
  7.         "index_prefixes": { }    
  8.       }
  9.     }
  10.   }
  11. }

An empty settings object will use the default min_chars and max_chars settings

This example uses custom prefix length settings:

  1. PUT my-index-000001
  2. {
  3.   "mappings": {
  4.     "properties": {
  5.       "full_name": {
  6.         "type": "text",
  7.         "index_prefixes": {
  8.           "min_chars" : 1,
  9.           "max_chars" : 10
  10.         }
  11.       }
  12.     }
  13.   }
  14. }