[Serverless]: Update the semantic search section in the docs

[szabosteve]

Serverless Docs

Elasticsearch

Description

1. Update the semantic search page under the Search your data section. A lot has happened in the semantic search domain since this page was updated, the latest changes are available in the classic docs.

2. Add a semantic_text tutorial next to the ELSER tutorial as a subpage of the semantic search page.

Resources and additional context

Source of information:

• semantic search page in the classic docs with the latest content
• semantic_text tutorial in the classic docs

[kosabogi]

The documentation team will be making a decision this week on our approach to handling cases where documentation would potentially be duplicated on serverless. We are considering whether to maintain deployment-specific guides or consolidate content to avoid redundancy. Once a decision is made, I'll proceed with the necessary updates and move this issue forward accordingly.

[kosabogi]

To avoid duplication, we decided to remove redundant content from the Serverless documentation and add a page with links and descriptions for existing tutorials in the Elasticsearch documentation.

After restructuring, the Semantic search page now has the following structure:

• Semantic search: Introduction, description, a list of recommended workflows, and a link to the guide in the Elasticsearch documentation.
• Semantic search with the inference API workflow: Introduction, description, and a link to the guide in the Elasticsearch documentation.
• Semantic search with semantic_text workflow: Introduction, description, and a link to the guide in the Elasticsearch documentation.
• Semantic search with a deployed model workflow: Introduction, description, and a link to the guide in the Elasticsearch documentation.

Updated documentation: Semantic search