As seen in prod and in parent task:
Warning: Search backend error during full_text search for 'forÀ' after 56. Partial failure: RemoteTransportException[[elastic1020][inet[/10.64.48.44:9300]][search/phase/fetch/id]]; nested: FetchPhaseExecutionException[[enwiktionary_content_1415228868][0]: query[filtered(((all.plain:forà | all:"(a à)"^0.5) all_near_match:forà)~1)->cache(_type:page)],from[0],size[4]: Fetch Failed [Failed to highlight field [title]]]; nested: ArrayIndexOutOfBoundsException; ,RemoteTransportException[[elastic1027][inet[/10.64.48.51:9300]][search/phase/fetch/id]]; nested: FetchPhaseExecutionException[[enwiktionary_content_1415228868][2]: query[filtered(((all.plain:forà | all:"(a à)"^0.5) all_near_match:forà)~1)->cache(_type:page)],from[0],size[4]: Fetch Failed [Failed to highlight field [title]]]; nested: ArrayIndexOutOfBoundsException; ,RemoteTransportException[[elastic1028][inet[/10.64.48.52:9300]][search/phase/fetch/id]]; nested: FetchPhaseExecutionException[[enwiktionary_content_1415228868][3]: query[filtered(((all.plain:forà | all:"(a à)"^0.5) all_near_match:forà)~1)->cache(_type:page)],from[0],size[4]: Fetch Failed [Failed to highlight field [title]]]; nested: ArrayIndexOutOfBoundsException; ,RemoteTransportException[[elastic1015][inet[/10.64.48.12:9300]][search/phase/fetch/id]]; nested: FetchPhaseExecutionException[[enwiktionary_content_1415228868][4]: query[filtered(((all.plain:forà | all:"(a à)"^0.5) all_near_match:forà)~1)->cache(_type:page)],from[0],size[4]: Fetch Failed [Failed to highlight field [title]]]; nested: ArrayIndexOutOfBoundsException; [Called from CirrusSearch\ElasticsearchIntermediary::failure in /srv/mediawiki/php-1.25wmf23/extensions/CirrusSearch/includes/ElasticsearchIntermediary.php at line 98] in /srv/mediawiki/php-1.25wmf23/includes/debug/MWDebug.php on line 300