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Showing content from https://www.elastic.co/docs/reference/query-languages/query-dsl/query-dsl-prefix-query below:

Prefix query | Reference

Returns documents that contain a specific prefix in a provided field.

The following search returns documents where the user.id field contains a term that begins with ki.

 GET /_search {
  "query": {
    "prefix": {
      "user.id": {
        "value": "ki"
      }
    }
  }
}

<field>

(Required, object) Field you wish to search.

value

(Required, string) Beginning characters of terms you wish to find in the provided <field>.

rewrite

(Optional, string) Method used to rewrite the query. For valid values and more information, see the rewrite parameter.

case_insensitive

Added in 7.10.0

This parameter was added in 7.10.0.

(Optional, Boolean) Allows ASCII case insensitive matching of the value with the indexed field values when set to true. Default is false which means the case sensitivity of matching depends on the underlying field’s mapping.

You can simplify the prefix query syntax by combining the <field> and value parameters. For example:

 GET /_search {
  "query": {
    "prefix" : { "user" : "ki" }
  }
}

You can speed up prefix queries using the index_prefixes mapping parameter. If enabled, Elasticsearch indexes prefixes in a separate field, according to the configuration settings. This lets Elasticsearch run prefix queries more efficiently at the cost of a larger index.

Prefix queries will not be executed if search.allow_expensive_queries is set to false. However, if index_prefixes are enabled, an optimised query is built which is not considered slow, and will be executed in spite of this setting.

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