Remove SearchEngineInterface::clearAllCache, keep last hour phrasea cache

lib/Alchemy/Phrasea/SearchEngine/Phrasea/PhraseaEngine.php

@@ -361,6 +361,7 @@ class PhraseaEngine implements SearchEngineInterface
     {
         $this->initialize();
         $this->checkSession();
+        $this->clearAllCache(new \DateTime('-1 hour'));
 
         assert(is_int($offset));
         assert($offset >= 0);

lib/Alchemy/Phrasea/SearchEngine/SearchEngineInterface.php

@@ -223,15 +223,6 @@ interface SearchEngineInterface
      */
     public function clearCache();
 
-    /**
-     * Clear all cache prior to the given date (if applicable)
-     *
-     * If no date provided, clear all entries
-     *
-     * @return SearchEngineInterface
-     */
-    public function clearAllCache(\DateTime $date = null);
-
     /**
      * Returns a subscriber
      *

lib/Alchemy/Phrasea/SearchEngine/SphinxSearch/SphinxSearchEngine.php

@@ -1071,13 +1071,4 @@ class SphinxSearchEngine implements SearchEngineInterface
     {
         return $this;
     }
-
-    /**
-     * @inheritdoc
-     */
-    public function clearAllCache(\DateTime $date = null)
-    {
-        return $this;
-    }
-
 }