How to Use Completion Suggester in Elasticsearch8

[ynanech]

Elastic.Clients.Elasticsearch version:8.9.2

Elasticsearch version:8.7.0

.NET runtime version:net7.0

Operating system version:win11

Description of the problem including expected versus actual behavior:

Question 1.

When creating a suggestion field and setting Contexts, the following methods do not take effect：

`

.Completion(t => t.Suggestions, //Settings not effective
t => t.Analyzer("suggest_analyzer")
.Contexts(c => c
.Type("CATEGORY")
.Name("merchantTab")
.Path(cp => cp.MerchantId.Suffix("tab"))
)
)

`

The following methods are effective：

`
.Completion(t => t.Suggestions, //Setting is valid
t => t.Analyzer("suggest_analyzer")
.Contexts(new SuggestContext[] {
new SuggestContext
{
Type = "CATEGORY",
Name = $"merchantTab",
Path = new Field("merchantId.tab")
}
})
)

`

Question 2.

Suggest doesn't work and won't get any results,But I used the same data, and there were results in Elasticsearch 7.17.5：

`

    public async Task<object> Suggest(string input)
    {
        var suggester = FieldSuggester.Completion(new CompletionSuggester
        {
            Contexts = new Dictionary<Field, ICollection<CompletionContext>> {
                   {"merchantTab", new List<CompletionContext>{ new CompletionContext {
                    Context=new Context (""),
                    Prefix=true,
                   } } }
                 },
            Fuzzy = new SuggestFuzziness
            {
                Fuzziness = new Fuzziness("auto"),
                MinLength = 1,
                PrefixLength = 2,
                Transpositions = true,
                UnicodeAware = false
            },
            Field = "suggestions",
            Size = 10,

            SkipDuplicates = true,
        });
        suggester.Prefix = input;
        //suggester.Text = input;

        string name = "product-suggest";
        var result = await _elasticClient.SearchAsync<ProductInfoDoc8>(m => m
                           .Index("frame.product8x")
                           .Suggest(new Suggester
                           {
                               Suggesters = new Dictionary<string, FieldSuggester> {
                                   { name, suggester}
                               }
                           }
                        ));
        return result.Fields.FirstOrDefault();
    }

`

[flobernd]

Hi there!

1. This looks like a bug. The descriptor functionality should be equivalent to the object initializer syntax.

2. The Suggestion property that contains the suggestion results, is currently missing from the search response. I re-implemented this functionality in Reintroduce suggestion feature #7894 which will be included in the next release.