Remove useless method in SearchEngineInterface

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

@@ -369,16 +369,6 @@ class ElasticSearchEngine implements SearchEngineInterface
         throw new RuntimeException('Elasticsearch engine currently does not support auto-complete.');
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function excerpt($query, $fields, \record_adapter $record, SearchEngineOptions $options = null)
-    {
-        //@todo implements
-
-        return array();
-    }
-
     /**
      * {@inheritdoc}
      */

lib/Alchemy/Phrasea/SearchEngine/SearchEngineInterface.php

@@ -182,17 +182,6 @@ interface SearchEngineInterface
      */
     public function autocomplete($query, SearchEngineOptions $options);
 
-    /**
-     * Highlight the fields of a record
-     *
-     * @param type            $query
-     * @param type            $fields
-     * @param \record_adapter $record
-     *
-     * @return array The array of highlighted fields
-     */
-    public function excerpt($query, $fields, \record_adapter $record, SearchEngineOptions $options = null);
-
     /**
      * Reset the cache of the SE (if applicable)
      *