@SdkInternalApi
    final EnableAvailabilityZonesForLoadBalancerResult executeEnableAvailabilityZonesForLoadBalancer(
            EnableAvailabilityZonesForLoadBalancerRequest enableAvailabilityZonesForLoadBalancerRequest) {

        ExecutionContext executionContext = createExecutionContext(enableAvailabilityZonesForLoadBalancerRequest);
        AWSRequestMetrics awsRequestMetrics = executionContext.getAwsRequestMetrics();
        awsRequestMetrics.startEvent(Field.ClientExecuteTime);
        Request<EnableAvailabilityZonesForLoadBalancerRequest> request = null;
        Response<EnableAvailabilityZonesForLoadBalancerResult> response = null;

        try {
            awsRequestMetrics.startEvent(Field.RequestMarshallTime);
            try {
                request = new EnableAvailabilityZonesForLoadBalancerRequestMarshaller().marshall(super
                        .beforeMarshalling(enableAvailabilityZonesForLoadBalancerRequest));
                // Binds the request metrics to the current request.
                request.setAWSRequestMetrics(awsRequestMetrics);
                request.addHandlerContext(HandlerContextKey.CLIENT_ENDPOINT, endpoint);
                request.addHandlerContext(HandlerContextKey.ENDPOINT_OVERRIDDEN, isEndpointOverridden());
                request.addHandlerContext(HandlerContextKey.SIGNING_REGION, getSigningRegion());
                request.addHandlerContext(HandlerContextKey.SERVICE_ID, "Elastic Load Balancing");
                request.addHandlerContext(HandlerContextKey.OPERATION_NAME, "EnableAvailabilityZonesForLoadBalancer");
                request.addHandlerContext(HandlerContextKey.ADVANCED_CONFIG, advancedConfig);

            } finally {
                awsRequestMetrics.endEvent(Field.RequestMarshallTime);
            }

            StaxResponseHandler<EnableAvailabilityZonesForLoadBalancerResult> responseHandler = new StaxResponseHandler<EnableAvailabilityZonesForLoadBalancerResult>(
                    new EnableAvailabilityZonesForLoadBalancerResultStaxUnmarshaller());

            response = invoke(request, responseHandler, executionContext);

            return response.getAwsResponse();

        } finally {

            endClientExecution(awsRequestMetrics, request, response);
        }
    }
<p>
Adds the specified Availability Zones to the set of Availability Zones for the specified load balancer in
EC2-Classic or a default VPC.
</p>
<p>
For load balancers in a non-default VPC, use <a>AttachLoadBalancerToSubnets</a>.
</p>
<p>
The load balancer evenly distributes requests across all its registered Availability Zones that contain
instances. For more information, see <a
href="https://docs.aws.amazon.com/elasticloadbalancing/latest/classic/enable-disable-az.html">Add or Remove
Availability Zones</a> in the <i>Classic Load Balancers Guide</i>.
</p>

@param enableAvailabilityZonesForLoadBalancerRequest
       Contains the parameters for EnableAvailabilityZonesForLoadBalancer.
@return Result of the EnableAvailabilityZonesForLoadBalancer operation returned by the service.
@throws LoadBalancerNotFoundException
        The specified load balancer does not exist.
@sample AmazonElasticLoadBalancing.EnableAvailabilityZonesForLoadBalancer
@see <a
     href="http://docs.aws.amazon.com/goto/WebAPI/elasticloadbalancing-2012-06-01/EnableAvailabilityZonesForLoadBalancer"
     target="_top">AWS API Documentation</a>
aws-java-sdk-elasticloadbalancing/src/main/java/com/amazonaws/services/elasticloadbalancing/AmazonElasticLoadBalancingClient.java