code: @BetaApi
    public final Operation startWithEncryptionKeyInstance(
        ProjectZoneInstanceName instance,
        InstancesStartWithEncryptionKeyRequest instancesStartWithEncryptionKeyRequestResource) {
  
      StartWithEncryptionKeyInstanceHttpRequest request =
          StartWithEncryptionKeyInstanceHttpRequest.newBuilder()
              .setInstance(instance == null ? null : instance.toString())
              .setInstancesStartWithEncryptionKeyRequestResource(
                  instancesStartWithEncryptionKeyRequestResource)
              .build();
      return startWithEncryptionKeyInstance(request);
    }
docs: Starts an instance that was stopped using the instances().stop method. For more information,
  see Restart an instance.
  
  <p>Sample code:
  
  <pre><code>
  try (InstanceClient instanceClient = InstanceClient.create()) {
  ProjectZoneInstanceName instance = ProjectZoneInstanceName.of("[PROJECT]", "[ZONE]", "[INSTANCE]");
  InstancesStartWithEncryptionKeyRequest instancesStartWithEncryptionKeyRequestResource = InstancesStartWithEncryptionKeyRequest.newBuilder().build();
  Operation response = instanceClient.startWithEncryptionKeyInstance(instance, instancesStartWithEncryptionKeyRequestResource);
  }
  </code></pre>
  
  @param instance Name of the instance resource to start.
  @param instancesStartWithEncryptionKeyRequestResource
  @throws com.google.api.gax.rpc.ApiException if the remote call fails