The dictionary of synonyms does not give the desired result.

The application uses rails 4.2 and standard gem elasticsearch. An additional filter by synonyms was needed for the search. A dictionary and filter documentation was written. But for some reason, not all words from the dictionary are correctly searched.

'апач, апачи, апаче => Apache' 'пхп => PHP' 'гит, гитхаб => Git' 'линукс => Linux' 'клиент-сервер => Client-Server' 'питон, пайтон, python3, python2 => Python' 

This format dictionary written in a separate file.

 synonym: { type: 'synonym', synonyms: Rails.root.join('config', 'elastic', 'synonyms_dictionary.txt').readlines.map(&:strip).join(',') }, 

and so its introduction to the filter looks like

The essence of the problem is that for some reason the search for synonyms behaves incorrectly. For example, \ by examples from the dictionary \, гит - не находит записей , but гитхаб - находит записи по слову git , питон|пайтон|python3 - не ищет записи , but python2 - находит записи по слову python . Линукс находит записи включающие слово Linux . And this is very strange and not understandable.