TYPO3 Core

Indexed search extbase experimental plugin (pi2) doesn't work after moving class alias to compatibility6 extension.

The indexed search plugin is registered like that:

\TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin($_EXTKEY, 'Pi2', array('Search' => 'form,search'), array('Search' => 'form,search'));

Which makes Extbase to generate following TS:

tt_content.list.20.indexedsearch_pi2 = USER
tt_content.list.20.indexedsearch_pi2 {
userFunc = TYPO3\CMS\Extbase\Core\Bootstrap->run
extensionName = IndexedSearch
pluginName = Pi2
}

Which then makes extbase to look for non namespaced class:
Tx_IndexedSearch_Controller_SearchController

instead of:

\TYPO3\CMS\IndexedSearch\Controller\SearchController

we can fix it in 2 ways:
1. Not breaking - move class alias for this clas from compatibility6 extension back to indexed search
2. Breaking change:
Change plugin registration code to:

\TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin('TYPO3\CMS.'.$_EXTKEY, 'Pi2', array('Search' => 'form,search'), array('Search' => 'form,search'));