Fix deserialization of S3 snapshot repository without settings

[Xtansia]

Description

Fixes deserialization of S3 snapshot repository without settings

Issues Resolved

Fixes #573

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[opensearch-trigger-bot]

The backport to 1.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-1.x 1.x
# Navigate to the new working tree
cd .worktrees/backport-1.x
# Create a new branch
git switch --create backport/backport-587-to-1.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 df942ab3d545cad71b1dc1c9222d6d4410c092c2
# Push it to GitHub
git push --set-upstream origin backport/backport-587-to-1.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-1.x

Then, create a pull request where the base branch is 1.x and the compare/head branch is backport/backport-587-to-1.x.

[opensearch-trigger-bot]

The backport to 1.7 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-1.7 1.7
# Navigate to the new working tree
cd .worktrees/backport-1.7
# Create a new branch
git switch --create backport/backport-587-to-1.7
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 df942ab3d545cad71b1dc1c9222d6d4410c092c2
# Push it to GitHub
git push --set-upstream origin backport/backport-587-to-1.7
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-1.7

Then, create a pull request where the base branch is 1.7 and the compare/head branch is backport/backport-587-to-1.7.