[BUGFIX] Callback in CrawlerHook of indexed_search sysext buggy

The property $callBack pointed to a Controller that was not existing.
Now it points back to the Hook.

Resolves: #50562
Releases: 6.2, 6.1, 6.0
Change-Id: I79e0ce73a23d98c5922ead43480202b3445282b2
Reviewed-on: https://review.typo3.org/22727
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
[BUGFIX] Indexing of external files does not work in indexed_search

After the namespace change a wrong replace was done in
indexed_search. Replace it with the correct class.

Change-Id: I35295f4fecde241ec3004a8ee6b7dd71d5e34e93
Resolves: #47106
Releases: 6.2, 6.1, 6.0
Reviewed-on: https://review.typo3.org/22907
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn