Cannot set mappings in document event subscriber for custom fields

[woellundwoell]

Steps to reproduce

• Create an Eventsubscriber with the function "onExtractMapping" for Pimcore\Bundle\GenericDataIndexBundle\Event\Document\ExtractMappingEvent::class
• Configure the subscriber in service.yaml
• Execute the "generic-data-index:update:index" command

The function "onExtractMapping" is never run through.

Reason

Wrong use of event class from "Asset-Namespace" in

generic-data-index-bundle/src/Service/SearchIndex/IndexService/IndexHandler/DocumentIndexHandler.php

Line 21 in 48dfc20

use Pimcore\Bundle\GenericDataIndexBundle\Event\Asset\ExtractMappingEvent;

and thus also dispatching the wrong Event type here

generic-data-index-bundle/src/Service/SearchIndex/IndexService/IndexHandler/DocumentIndexHandler.php

Lines 89 to 90 in 48dfc20

	$extractMappingEvent = new ExtractMappingEvent($customFields);
	$this->eventDispatcher->dispatch($extractMappingEvent);