[Backport 2.1] Change auto expand replicas to 0-2

[opensearch-trigger-bot]

Backport e0a3052 from #1186

[codecov-commenter]

Codecov Report

Merging #1191 (067beb9) into 2.1 (2cb2bbd) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##                2.1    #1191   +/-   ##
=========================================
  Coverage     59.15%   59.15%           
  Complexity      283      283           
=========================================
  Files           240      240           
  Lines          7833     7833           
  Branches       1621     1578   -43     
=========================================
  Hits           4634     4634           
- Misses         3025     3027    +2     
+ Partials        174      172    -2     

Flag	Coverage Δ
dashboards-observability	52.54% <ø> (ø)
opensearch-observability	76.60% <ø> (ø)

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Impacted Files	Coverage Δ
...mponents/event_analytics/hooks/use_fetch_events.ts	1.29% <0.00%> (ø)

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