原英文版地址: https://www.elastic.co/guide/en/elasticsearch/reference/7.7/index-prefixes.html, 原文档版权归 www.elastic.co 所有
本地英文版地址: ../en/index-prefixes.html
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Elasticsearch Guide [7.7] » Mapping » Mapping parameters » index_prefixes
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index_prefixesedit

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:

PUT my_index
{
  "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:

PUT my_index
{
  "mappings": {
    "properties": {
      "full_name": {
        "type": "text",
        "index_prefixes": {
          "min_chars" : 1,
          "max_chars" : 10
        }
      }
    }
  }
}
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