[Maps] Upload GeoJSON fails with 408 error in cloud

[nickpeihl]

Kibana version:
7.9.0-snapshot

Elasticsearch version:
7.9.0-snapshot

Server OS version:
ESS cloud

Browser version:
Firefox 78.0.2

Browser OS version:
MacOS Mojave

Original install method (e.g. download page, yum, from source, etc.):
Deployed on Elastic Cloud

Describe the bug:
When using Upload GeoJSON with a large, but still under the 50MB limit, file in Elastic Cloud, the ingest step fails without returning any errors. This bug seems to be only happening in Cloud environments.

Steps to reproduce:

1. Start a Cloud deployment for 7.9.0
2. In Maps, add a layer using Upload GeoJSON. Use this file.
3. The ingest will eventually fail but not return any errors in the UI.

Screenshots (if relevant):

Errors in browser console (if relevant):
In browser console
Uncaught (in promise) TypeError: indexDataResp.failures is undefined

In Network tab
408 Request Timeout

[jsanz]

maybe duplicate of #60710 and related with #48194

[nreese]

Confirmed on cloud. Can now upload larger files that were receiving 408