Elasticsearch connector node js integration

[yansavitski]

Description

Add APIProxyConnector to Elasticsearch Connector for enhances security by keeping API keys and Elasticsearch details hidden from the frontend and shows the recommended way to use Search UI in real-world applications

List of changes

• A working example of the API Proxy connector (client-side).
• A simple Express.js server implementation using the Elasticsearch connector.
• Updated sandbox links and examples structure for clarity.
• Update sandbox ui home page
• Add typescript to sandbox example
• Update react version for sandbox example

Associated Github Issues

[github-actions]

A documentation preview will be available soon.

• 🔨 Buildkite builds
• 📚 HTML diff
• 📙 Preview page

Request a new doc build by commenting

• Rebuild this PR: run docs-build
• Rebuild this PR and all Elastic docs: run docs-build rebuild

_{run docs-build is much faster than run docs-build rebuild. A rebuild should only be needed in rare situations.}

_{If your PR continues to fail for an unknown reason, the doc build pipeline may be broken. Elastic employees can check the pipeline status here.}

[joemcelroy]

looks good - are you planning on adding the documentation changes also to this pr?

[yansavitski]

looks good - are you planning on adding the documentation changes also to this pr?

I will. So we can make release right after to have sandbox wroking. Because it requires new ApiProxyConnector, so if we do merge now without release it breaks sandbox

[leemthompo]

@yansavitski the docs changes look good apart from one detail. I think we need to preserve original custom anchor IDs for headings exactly as they were. We shouldn't create new anchors like tutorials-elasticsearch-connection-and-authentication - instead reuse api-connectors-elasticsearch-connection-and-authentication even in the new files.

This will ensure all existing external links and bookmarks stay valid.

[leemthompo]

Docs updates LGTM. Nice 👌.

[leemthompo]

not sure if wanted to swap these two in toc?

[yansavitski]

No, thank you, it was intentional, because previous tutorials are related and last one tutorials more like a standalone