private static ElasticClient CreateElasticClient(IClientSettings settings)
{
var uris = settings.ConnectionPool.Select(a => new Uri(a));
var connectionPool = new SniffingConnectionPool(uris);
var connectionSettings = new ConnectionSettings(connectionPool,settings.DefaultIndex);
if(settings.Authorization != null) connectionSettings.SetBasicAuthentication(settings.Authorization.Username, settings.Authorization.Password);
return new ElasticClient(connectionSettings);
}