## Summary
Updated the ES3 (Serverless Search) default home route to be the global
empty state, when `search_indices` is enabled.
Moved the getting started page, the current homepage, from
`/app/elasticsearch` to `/app/elasticsearch/getting_started`
This required adding a redirect for `/app/elasticsearch` to
`/app/elasticsearch/start`.

After we enabled `search_indices` by default for ES3, we can remove the
conditional logic added by this PR.

### Screenshots
ES3 Home With search indices config FF enabled

![image](https://github.com/user-attachments/assets/9a2227c0-8ec3-4e98-ba5c-08cebf8d3df4)
ES3 Home with search indices config FF disabled

![image](https://github.com/user-attachments/assets/68bb6f36-f754-4f6b-9637-cf419ef21945)

### Checklist

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [ ] [Flaky Test
Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was
used on any tests changed

(cherry picked from commit d573915)

… (#195431)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[Search][Onboarding] Default home to Global Empty State
(#195142)](#195142)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Rodney
Norris","email":"rodney.norris@elastic.co"},"sourceCommit":{"committedDate":"2024-10-08T14:29:59Z","message":"[Search][Onboarding]
Default home to Global Empty State (#195142)\n\n## Summary\r\nUpdated
the ES3 (Serverless Search) default home route to be the global\r\nempty
state, when `search_indices` is enabled.\r\nMoved the getting started
page, the current homepage, from\r\n`/app/elasticsearch` to
`/app/elasticsearch/getting_started`\r\nThis required adding a redirect
for `/app/elasticsearch` to\r\n`/app/elasticsearch/start`.\r\n\r\nAfter
we enabled `search_indices` by default for ES3, we can remove
the\r\nconditional logic added by this PR.\r\n\r\n### Screenshots\r\nES3
Home With search indices config FF
enabled\r\n\r\n![image](https://github.com/user-attachments/assets/9a2227c0-8ec3-4e98-ba5c-08cebf8d3df4)\r\nES3
Home with search indices config FF
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Checklist\r\n\r\n- [x] [Unit or
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Default home to Global Empty
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Default home to Global Empty State (#195142)\n\n## Summary\r\nUpdated
the ES3 (Serverless Search) default home route to be the global\r\nempty
state, when `search_indices` is enabled.\r\nMoved the getting started
page, the current homepage, from\r\n`/app/elasticsearch` to
`/app/elasticsearch/getting_started`\r\nThis required adding a redirect
for `/app/elasticsearch` to\r\n`/app/elasticsearch/start`.\r\n\r\nAfter
we enabled `search_indices` by default for ES3, we can remove
the\r\nconditional logic added by this PR.\r\n\r\n### Screenshots\r\nES3
Home With search indices config FF
enabled\r\n\r\n![image](https://github.com/user-attachments/assets/9a2227c0-8ec3-4e98-ba5c-08cebf8d3df4)\r\nES3
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Checklist\r\n\r\n- [x] [Unit or
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Default home to Global Empty State (#195142)\n\n## Summary\r\nUpdated
the ES3 (Serverless Search) default home route to be the global\r\nempty
state, when `search_indices` is enabled.\r\nMoved the getting started
page, the current homepage, from\r\n`/app/elasticsearch` to
`/app/elasticsearch/getting_started`\r\nThis required adding a redirect
for `/app/elasticsearch` to\r\n`/app/elasticsearch/start`.\r\n\r\nAfter
we enabled `search_indices` by default for ES3, we can remove
the\r\nconditional logic added by this PR.\r\n\r\n### Screenshots\r\nES3
Home With search indices config FF
enabled\r\n\r\n![image](https://github.com/user-attachments/assets/9a2227c0-8ec3-4e98-ba5c-08cebf8d3df4)\r\nES3
Home with search indices config FF
disabled\r\n\r\n![image](https://github.com/user-attachments/assets/68bb6f36-f754-4f6b-9637-cf419ef21945)\r\n\r\n\r\n###
Checklist\r\n\r\n- [x] [Unit or
functional\r\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\r\nwere
updated or added to match the most common scenarios\r\n- [ ] [Flaky
Test\r\nRunner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1)
was\r\nused on any tests
changed","sha":"d573915dd30c62adb780728ab83668285f5bd64d"}}]}]
BACKPORT-->

Co-authored-by: Rodney Norris <rodney.norris@elastic.co>