Upadte admin credential in integration test

[Hailong-am]

Issue #, if available:
#1064

Description of changes:

1. upadte admin credential in integration test

CheckList:

• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6270b2c) 74.86% compared to head (30d1825) 74.87%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1076      +/-   ##
============================================
+ Coverage     74.86%   74.87%   +0.01%     
- Complexity     2808     2810       +2     
============================================
  Files           367      367              
  Lines         16518    16518              
  Branches       2362     2362              
============================================
+ Hits          12366    12368       +2     
+ Misses         2853     2847       -6     
- Partials       1299     1303       +4     

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[DarshitChanpura]

ty @Hailong-am !

[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/index-management/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/index-management/backport-2.x
# Create a new branch
git switch --create backport/backport-1076-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 2a33173a0e24b1dd6d78543d67591d6fd637df33
# Push it to GitHub
git push --set-upstream origin backport/backport-1076-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/index-management/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-1076-to-2.x.

[bowenlan-amzn]

@Hailong-am can you manual backport when you got time, thanks!

[Hailong-am]

git worktree remove ../.worktrees/index-management/backport-2.x

sure, here is the PR #1084