[META][9.2] Feature documentation for Search

[szabosteve]

Description

This is the meta issue to track the requirements for the 9.2 feature documentation for search. Sub items may have their own GitHub issues.

• CCS for semantic_text (?)
• ELSER on EIS https://github.com/elastic/search-team/issues/10758 and https://github.com/elastic/search-team/issues/11055 @szabosteve
• ES|QL – dev team work on it, @leemthompo for review
• Disk BBQ @kosabogi
• Reranking on snippets
• Vectors are excluded from _source by default: https://github.com/elastic/developer-docs-team/issues/339
• WorkChat / 1Chat @leemthompo