ElasticClient unable to connect to Elasticsearch server running on k8s

Actually now I am able to connect with using this configuration in code

var connSettings = new ConnectionSettings(new Uri("https://elastic-cluster-es-http.default.svc.cluster.local:9200"))
    .BasicAuthentication("elastic", "testPassword")
    .ThrowExceptions()
    .EnableApiVersioningHeader()
    .ServerCertificateValidationCallback((o, certificate, chain, errors) => true)
    .ServerCertificateValidationCallback(CertificateValidations.AllowAll);