code: public Observable<ServiceResponse<Void>> acquireWithServiceResponseAsync(String resourceGroupName, String serverName, String dnsAliasName, String oldServerDnsAliasId) {
          if (resourceGroupName == null) {
              throw new IllegalArgumentException("Parameter resourceGroupName is required and cannot be null.");
          }
          if (serverName == null) {
              throw new IllegalArgumentException("Parameter serverName is required and cannot be null.");
          }
          if (dnsAliasName == null) {
              throw new IllegalArgumentException("Parameter dnsAliasName is required and cannot be null.");
          }
          if (this.client.subscriptionId() == null) {
              throw new IllegalArgumentException("Parameter this.client.subscriptionId() is required and cannot be null.");
          }
          if (this.client.apiVersion() == null) {
              throw new IllegalArgumentException("Parameter this.client.apiVersion() is required and cannot be null.");
          }
          ServerDnsAliasAcquisition parameters = new ServerDnsAliasAcquisition();
          parameters.withOldServerDnsAliasId(oldServerDnsAliasId);
          Observable<Response<ResponseBody>> observable = service.acquire(resourceGroupName, serverName, dnsAliasName, this.client.subscriptionId(), this.client.apiVersion(), this.client.acceptLanguage(), parameters, this.client.userAgent());
          return client.getAzureClient().getPostOrDeleteResultAsync(observable, new TypeToken<Void>() { }.getType());
      }
docs: Acquires server DNS alias from another server.
  
  @param resourceGroupName The name of the resource group that contains the resource. You can obtain this value from the Azure Resource Manager API or the portal.
  @param serverName The name of the server that the alias is pointing to.
  @param dnsAliasName The name of the server dns alias.
  @param oldServerDnsAliasId The id of the server alias that will be acquired to point to this server instead.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable for the request