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Elastic Docs ›Elasticsearch Guide [8.10] ›Mapping ›Mapping parameters

index_prefixes

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index_prefixes

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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:

response = client.indices.create(
  index: 'my-index-000001',
  body: {
    mappings: {
      properties: {
        body_text: {
          type: 'text',
          index_prefixes: {}
        }
      }
    }
  }
)
puts response
PUT my-index-000001
{
  "mappings": {
    "properties": {
      "body_text": {
        "type": "text",
        "index_prefixes": { }    
      }
    }
  }
}

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

This example uses custom prefix length settings:

response = client.indices.create(
  index: 'my-index-000001',
  body: {
    mappings: {
      properties: {
        full_name: {
          type: 'text',
          index_prefixes: {
            min_chars: 1,
            max_chars: 10
          }
        }
      }
    }
  }
)
puts response
PUT my-index-000001
{
  "mappings": {
    "properties": {
      "full_name": {
        "type": "text",
        "index_prefixes": {
          "min_chars" : 1,
          "max_chars" : 10
        }
      }
    }
  }
}
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