Add Form for ElasticSearch Configuration.

Also changed type from array to Options object.

lib/Alchemy/Phrasea/SearchEngine/Elastic/ElasticSearchEngine.php

@@ -100,18 +100,6 @@ class ElasticSearchEngine implements SearchEngineInterface
         return $ret;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function getConfigurationPanel()
-    {
-        if (!$this->configurationPanel) {
-            $this->configurationPanel = new ConfigurationPanel($this->app, $this->app['conf']);
-        }
-
-        return $this->configurationPanel;
-    }
-
     /**
      * {@inheritdoc}
      */