ElasticSearch Query Issue for Alphanumeric Values

Elastic Stack Elasticsearch
1

I am new to ElasticSearch NEST and trying to integrate in my application. One issue i am facing while searching with Alphanumeric feild like I have one feild UniqueID whose value starts with 'h' and followed by some integers values and length of the feild value is 11.

For Example :
UniqueID
h4212423321
h4212423122
h4212413323
h4212421324
h4212423225
h4212423316

Like this i have more than 100000 records data to be indexed.

Problem : When i search for UniqueID='h', I am getting max 250 results only, But all the 100000 records startswith 'h'. So all records should come. I need help in searching all data.

Please find the my Query Code :

var result = client.Search<MemberListDto>(s => s
                   .Size(10000)
                   .Query(q =>
                               q.MatchPhrasePrefix((mq => mq.Field(f => f.UniqueID).Query(UniqueID))) 
                       ));

return result.Total;

My POCO c# class for this is

    public class MemberListDto
{
    [String(Analyzer = "keyword", SearchAnalyzer = "keyword")]
    public string UniqueID { get; set; }

    [String(Analyzer = "keyword", SearchAnalyzer = "keyword")]
    public string SubscriberID { get; set; }

}

My Method to index list of MemberListDto is :
public void CreateBulkIndex(List data, string indexName, string typeName) where T : class
{

        if (!_client.IndexExists(ElasticConfig.IndexName).Exists)
        {
            var indexDescriptor = new CreateIndexDescriptor(ElasticConfig.IndexName)
                .Mappings(ms => ms
                    .Map<T>(m => m.AutoMap()));
           
            _client.CreateIndex(ElasticConfig.IndexName, i => indexDescriptor);
        }
        _client.Bulk(b => b.IndexMany(data, (d, doc) => d.Document(doc).Index(indexName)));
        
    }
2

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