Investigate the possibility of moving rolling index builds into the server. Try to get an idea of:

• Whether this is even feasible
• Rough implementation paths
• How this fits in with long-term architecture (e.g. disaggregated storage)

There was a relevant slack thread here
(dumped here since it's about to hit the Slack retention)

See https://docs.google.com/document/d/10fXT9talhNzpXsW3b6npL-i-9hn388D1qMPVZByRFu0/edit?tab=t.0#bookmark=id.ffbs2bw6nzfx for notes from cross-team sync