Description

Not all rooms use English characters, but In Synapse Admin API's Rooms query seach_term don't accept non-ASCII characters.

Steps to reproduce

For example query to search rooms with Russian symbol "ж" using path /_synapse/admin/v1/rooms?dir=f&from=0&limit=10&order_by=name&search_term=%D0%B6 shows the error:

{
  "errcode":"M_UNKNOWN",
  "error":"Query parameter 'search_term' must be ascii"
}

Version information

• Synapse Version:
  "server_version": "1.42.0",
  "python_version": "3.8.10"