Add sample config of multi data source to yml template.

[zengyan-amazon]

Description

Add sample config of multi data source to yml template.

Issues Resolved

#2427

Check List

• All tests pass
  • yarn test:jest
  • yarn test:jest_integration
  • yarn test:ftr
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff

[ashwin-pc]

nit: For consistency, can we add a space between the comment delimiter and the config key?

[zengyan-amazon]

I think the convention in this file is:

• for comments/explanations, put a space between comment content and comment delimiter #
• for sample config key/settings, no space between config key and comment delimiter #
  So that it is easy for people to differentiate comment/explanations vs. sample configs

[zhongnansu]

lgtm

[joshuarrrr]

Can/should we link to documentation for these settings? It's not at all clear from this file alone what valid values here might look like.

[zengyan-amazon]

I don't see other settings has reference to document in the template. there is another PR which provides document of all settings in README #2448

[codecov-commenter]

Codecov Report

Merging #2428 (6371619) into main (806e96c) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2428      +/-   ##
==========================================
+ Coverage   66.74%   66.75%   +0.01%     
==========================================
  Files        3194     3200       +6     
  Lines       60803    60886      +83     
  Branches     9238     9250      +12     
==========================================
+ Hits        40583    40646      +63     
- Misses      18011    18029      +18     
- Partials     2209     2211       +2     

Impacted Files	Coverage Δ
.../plugins/data_source/server/data_source_service.ts	75.00% <0.00%> (-8.34%)	⬇️
...gins/data_source/server/client/configure_client.ts	80.00% <0.00%> (-4.85%)	⬇️
...blic/application/utils/use/use_saved_wizard_vis.ts	2.50% <0.00%> (-0.84%)	⬇️
...pplication/components/data_tab/secondary_panel.tsx	2.32% <0.00%> (-0.24%)	⬇️
src/core/server/http/router/router.ts	74.54% <0.00%> (ø)
...c/plugins/data_source/server/client/client_pool.ts	58.82% <0.00%> (ø)
...s/wizard/public/application/components/top_nav.tsx	5.88% <0.00%> (ø)
...public/visualizations/common/expression_helpers.ts	11.11% <0.00%> (ø)
...index_patterns/fetcher/lib/resolve_time_pattern.ts	100.00% <0.00%> (ø)
...s/wizard/public/saved_visualizations/transforms.ts	100.00% <0.00%> (ø)
... and 14 more

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[noCharger]

Overall lgtm, we might also add audit configs after it's complete

[ananzh]

I see @ashwin-pc and @joshuarrrr comments have been resolved.
LGTM

[ashwin-pc]

@zengyan-amazon looks like your original commit is missing a signoff, the rest LGTM

[zengyan-amazon]

fixed sign off commit

[opensearch-trigger-bot]

The backport to 2.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-2.x 2.x
# Navigate to the new working tree
cd .worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-2428-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 60efd3bacab8a092bacb5842854d41bf48423fdc
# Push it to GitHub
git push --set-upstream origin backport/backport-2428-to-2.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-2428-to-2.x.