Increase default index replicas to 5

[dbwiddis]

Description

Changes default index replicas to (up to) 5.

Related Issues

Resolves #915

Check List

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.07%. Comparing base (5647132) to head (41e2ba9).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #916   +/-   ##
=========================================
  Coverage     78.07%   78.07%           
  Complexity      996      996           
=========================================
  Files            99       99           
  Lines          4625     4625           
  Branches        431      431           
=========================================
  Hits           3611     3611           
  Misses          834      834           
  Partials        180      180           

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