ECS Service Connect 504/Timeout

Hello, after enabling ECS Service Connect we started noticing that requests longer than 15s are cancelled and a 504 response is returned:

content-length: 24
content-type: text/plain
date: Wed, 25 Jan 2023 19:42:08 GMT
server: envoy

Seems that envoy is enforcing this 15s timeout.

Is this assumption correct? If so, is there any way to configure the timeout?