The searching feature is not able to wildcard-search for some long English words end with with "-ation", "-lization" and other similar combinations. This is probably due to the behaviour of the English analyzer (meaning, switching indexing method to Russian or other languages fixes the problem)

For example,
1. Create an issue with summary: Internationalization
2. Navigate to Find issues, search for issues with internation?lization

Result: No matching issues found