code: public ZoneDeleteResultInner beginDelete(String resourceGroupName, String zoneName, String ifMatch) {
          return beginDeleteWithServiceResponseAsync(resourceGroupName, zoneName, ifMatch).toBlocking().single().body();
      }
docs: Deletes a DNS zone. WARNING: All DNS records in the zone will also be deleted. This operation cannot be undone.
  
  @param resourceGroupName The name of the resource group.
  @param zoneName The name of the DNS zone (without a terminating dot).
  @param ifMatch The etag of the DNS zone. Omit this value to always delete the current zone. Specify the last-seen etag value to prevent accidentally deleting any concurrent changes.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the ZoneDeleteResultInner object if successful.