Fix incorrect statement in README.md
Fix elastic#329

…elastic#329)

Terraform: add target stickiness to EMS load balancing

Simply relying on least_outstanding_requests for balancing between EMS nodes
didn't provide the result we hoped for - many times the cluster was out of
balance. Maybe because each client has multiple EMS adaptors and during the
time of connection, the ALB does not "know" if this will be a socket connection
or a simple request. By adding stickiness based on the Engageli session cookie
all requests from a single client end up on the same host. This is probably a
temporary measure until we implement our own traffic steering layer.


Approved-by: Can Yildiz
Approved-by: fabien
Approved-by: Andre Sodermans

🤖 ESQL: Merge upstream

With this commit we don't purge the CDN cache anymore after a new change
to the benchmarks page has been deployed but add a clarifying note about
the CDN cache expiration time. We are dropping cache purge after infra
has moved from Fastly to Google's CDN where they have configured a cache
expiry of 10 minutes. Given that the timeout is so small, we don't push
changes very often and purging the cache on Google's CDN is a bit more
involved, our team has decided that we just let the stale cache entry
expire.

Closes elastic#322