Problem: ES optimization recommendations in Admin manual are out of date for current ES version

Reported in the user forum, 2025-06-18:

* https://groups.google.com/g/ica-atom-users/c/OmfPCKEMo4w/m/U6w3ECYLBgAJ

In the 2.9 Admin doc page on Elasticsearch, it recommends disabling auto-discovery by setting the Transport Type to Local for performance:

* https://www.accesstomemory.org/docs/2.9/admin-manual/maintenance/elasticsearch/#disable-auto-discovery

However, as of ES 6.0 and later, Local Transport has been removed. Attempting to make this change in AtoM 2.9 or later causes ES to crash. See:

* https://discuss.elastic.co/t/no-more-local-transport-on-6-0-x/102416

Open the 2.9 Admin manual’s Elasticsearch page and inspect the “Disable auto-discovery” section, using the linked Elasticsearch discussion to confirm that Local Transport was removed in ES 6. Update the recommendation so it no longer directs users to a setting that crashes Elasticsearch, then verify the rendered documentation reflects the current guidance.

Written by the indexing model from the issue text.