How our doc cog works? is it based on the sentence encoder or including the translation part?

Condition :
bot is multilingual bot.
Uploaded Docs is in English.
When I try now :
When i try to search in english "How to change flight for eCoupon Bookings?" >> Our document search is giving me a correct document (document found)
When i use Bahasa Indonesia and search the same sentence in Bahasa Indonesia "Bagaimana cara mengubah pemesanan eCoupon?" >> Our document search is not giving me a document. document not found.

Should i raise this as a feature request or bugs?

i need to give an answer to client.