Update elasticsearch recommended translog configuration

We should recommend turning the translog option from request to async on any mass processing. Especially on the sequence (nuxeo-uidgen) index.

Explain how to check the translog configuration:
curl localhost:9200/nuxeo-uidgen/_settings?pretty

How to turn it async:

curl -H "Content-Type: application/json" -XPUT "http://localhost:9200/nuxeo-uidgen/_settings" -d '{
  "index.translog.durability" : "async"
}'

curl -H "Content-Type: application/json" -XPUT "http://localhost:9200/nuxeo-audit/_settings" -d '{
  "index.translog.durability" : "async"
}'

How to persist the settings, since Nuxeo 10.3 (NXP-25587) we can turn all index translog to async.