/// <summary>
 /// Executes a query that allows traversing relationships and filtering by
 /// property values.
 /// Status codes:
 /// 200 (OK): Success.
 /// 400 (Bad Request): The request is invalid.
 /// </summary>
 /// <param name='operations'>
 /// The operations group for this extension method.
 /// </param>
 /// <param name='querySpecification'>
 /// The query specification to execute.
 /// </param>
 /// <param name='cancellationToken'>
 /// The cancellation token.
 /// </param>
 public static async Task <QueryResult> QueryTwinsAsync(this IQueryOperations operations, QuerySpecification querySpecification, CancellationToken cancellationToken = default(CancellationToken))
 {
     using (var _result = await operations.QueryTwinsWithHttpMessagesAsync(querySpecification, null, cancellationToken).ConfigureAwait(false))
     {
         return(_result.Body);
     }
 }