private async Task SetupAnlyzer(IElasticClient elasticClient, IndexName indexName) { await elasticClient.CloseIndexAsync(indexName); await elasticClient.UpdateIndexSettingsAsync( new UpdateIndexSettingsRequest(indexName) { IndexSettings = new IndexSettings { Analysis = new Analysis { Analyzers = new Analyzers { { "default", new CustomAnalyzer() { Filter = new [] { "lowercase" }, Tokenizer = "whitespace" } } } } } }); await elasticClient.OpenIndexAsync(indexName); }