title: TYPO3 cms-indexed-search core extension missing RouteEnhancer?
body: <p>we are updating an ancient TYPO3 project, we already run on TYPO3 9.5 and its looking good after alot of refactoring. </p>
  
  <p>now i rework the ext:indexed_search section which got implemented into the T3Core (sysext:indexed_search). so if i disable/remove my site configuration, the search just works out of the box.  once i enable our default site configuration, holding: </p>
  
  <pre><code>base: 'ourDomain'
  baseVariants:
    -
      base: 'ourDomain'
      condition: 'applicationContext == "Development"'
    -
      base: 'ourDomain'
      condition: 'applicationContext == "Testing"'
  errorHandling: {  }
  languages:
    -
      title: Deutsch
      enabled: true
      base: /
      typo3Language: de
      locale: de_DE
      iso-639-1: de
      navigationTitle: Deutsch
      hreflang: de-DE
      direction: ''
      flag: at
      languageId: '0'
  rootPageId: 1
  routes: {  }
  routeEnhancers:
  </code></pre>
  
  <p>the search does not work properly anymore. i can navigate to the search page and still have the search form and stuff but no results are shown. im dumping $search inside SearchController and saw that its actually empty no matter what.</p>
  
  <p>after some research i thought the RouteEnhancer configuration could be the problem, so i added some configuration to the site cfg</p>
  
  <pre><code>routeEnhancers:
    IndexedSearchPlugin:
      type: Extbase
      limitToPages:
        - 41
      extension: IndexedSearch
      plugin: Pi2
      routes:
        - routePath: '/search'
          _controller: 'Search::search'
      defaultController: 'Search::search'
  </code></pre>
  
  <p>so as child of our root-page we have a page called "Suche"(route=/suche) which holds the indexed_search plugin.</p>
  
  <p>so the RouteEnhancer should work like domain.at/suche -> hit search -> /suche/search results, right? it seems like everything works but the data from the search input field is just missing... so there are no results.</p>
  
  <p>i cannot get this to work since quite some time now, help is much appreciated</p>