[MD] UX refactor for datasource create page (#2501) (#2559)

* UX refactor for datasource create page

Signed-off-by: Yibo Wang <yibow@amazon.com>

* address comments&add CHANGLOG

Signed-off-by: Yibo Wang <yibow@amazon.com>

* Apply callout in all ds pages & update endpoint field placeholder text

Signed-off-by: Yibo Wang <yibow@amazon.com>

* add documentation links

Signed-off-by: Yibo Wang <yibow@amazon.com>

* update snapshot test and snapshots

Signed-off-by: Yibo Wang <yibow@amazon.com>

* Update CHANGELOG.md&.lycheeexclude

Signed-off-by: Yibo Wang <yibow@amazon.com>

* Update UT

Signed-off-by: Yibo Wang <yibow@amazon.com>

Signed-off-by: Yibo Wang <yibow@amazon.com>
(cherry picked from commit 9b56ff5)

Co-authored-by: Yibo Wang <109543558+yibow98@users.noreply.github.com>

.lycheeexclude

@@ -87,6 +87,7 @@ https://opensearch.org/cool/path
 https://opensearch.org/redirect
 http://www.opensearch.org/painlessDocs
 https://www.hostedgraphite.com/
+https://connectionurl.com
 
 # External urls
 https://www.zeek.org/
@@ -114,3 +115,4 @@ https://a.tile.openstreetmap.org/
 http://www.creedthoughts.gov
 https://media-for-the-masses.theacademyofperformingartsandscience.org/
 https://yarnpkg.com/latest.msi
+https://forum.opensearch.org/

CHANGELOG.md

@@ -54,7 +54,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ### 📈 Features/Enhancements
 
-* Add updated_at column to objects' tables ([#1218](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/1218)) 
+* Add updated_at column to objects' tables ([#1218](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/1218))
 * [Viz Builder] State validation before dispatching and loading ([#2351](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2351))
 * [Multi DataSource] UX enhacement on index pattern management stack ([#2505](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2505))
 * [Multi DataSource] UX enhancement on Data source management stack ([#2521](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2521))

src/core/public/doc_links/doc_links_service.ts

@@ -397,6 +397,8 @@ export class DocLinksService {
           functionbeat: `https://opensearch.org/docs/latest/downloads/beats/functionbeat`,
           winlogbeat: `${OPENSEARCH_WEBSITE_DOCS}`,
           siem: `${OPENSEARCH_WEBSITE_DOCS}`,
+          openSearchForum:
+            'https://forum.opensearch.org/t/feedback-experimental-feature-connect-to-external-data-sources/11144',
           indexPatterns: {
             loadingData: `${OPENSEARCH_WEBSITE_DOCS}`,
             introduction: `${OPENSEARCH_WEBSITE_DOCS}`,
@@ -752,6 +754,7 @@ export interface DocLinksStart {
       readonly functionbeat: string;
       readonly winlogbeat: string;
       readonly siem: string;
+      readonly openSearchForum: string;
       readonly indexPatterns: {
         readonly loadingData: string;
         readonly introduction: string;