How to complete a common word from bunch of docs

Elastic Stack Elasticsearch
1

Hi there,

I'm trying to use 'search_as_you_type' for auto complete. I got the idea of how this works, but stuck with a basic scneario.

for exmaple I have a field with type 'search_as_you_type'

{
  "mappings": {
    "properties": {
      "my_field": {
        "type": "search_as_you_type"
      }
    }
  }
}

and the docs are like:

{"my_field":"apple dog bob and light"}

{"my_field":"apple doll charlie "}

{"my_field":"apple doll cat"}

{"my_field":"apple donut who does not like"}

when search with "apple d", I will get all these docs returned, which is good as design.
But as auto completion, I may only want "dog", "doll" and "donut" as completion of "d".

For this case, if the result number is set to 3, then "donut" will lose.

I tries to aggregate on 'my_field._2gram' to get at least "apple dog","apple doll" and "apple donut", but seems I can not do it.

Is there any solution for such case?

Thanks.

2

If you are searching for a prefix based suggester, then the completion suggester might be what you are after. See Suggesters | Elasticsearch Guide [8.1] | Elastic

This query always returns whole documents and their contents, regardless of how you query.

3

Actually I don't want the whole content, for example I have docs with title:

final fantasy 7 remake
final cut pro
finance report and investigation 
finale inventory

When search for 'fin', I want the result to be 'final', 'finance' and 'finale.
Any idea for this scenario?
thx