[TASK] Reduce default ES replica auto-expansion

[wezell]

Description

Our current ES configuration hardcodes the ES config value index.auto_expand_replicas=0-all. This means that if are running an index in an ES cluster with 4 data nodes, elasticsearch will automatically set an index's replicas to 4. This number of replicas are unnecessary and consumes too much disk space and network traffic to keep in sync.

By default we should only expand to 1 index replica for redundancy. Any more than that becomes overkill.

Acceptance Criteria

• change default for index.auto_expand_replicas to 0-1
• Allow for the value to configured via env variable.

Priority

None

Additional Context

https://dotcms.slack.com/archives/C06TM536N9J/p1770991967073849?thread_ts=1770991961.739489&cid=C06TM536N9J

[github-actions]

PRs linked to this issue

• task(index): Allow replica auto-expansion to be configured and set a more intelligent default. by @wezell

[yolabingo]

#33429
similar request to add

DOT_ES_INDEX_NUMBER_OF_SHARDS
DOT_ES_INDEX_NUMBER_OF_REPLICAS
DOT_ES_INDEX_AUTO_EXPAND_REPLICAS