Add documentation for query rules retriever (#115696)
* Add initial query rules retriever docs
* Add docs tests
* Apply suggestions from code review
Co-authored-by: Liam Thompson <32779855+leemthompo@users.noreply.github.com>
* PR feedback
* Make query rules guide retriever-first
* Add warning to DSL doc
* Update docs/reference/search/retriever.asciidoc
Co-authored-by: Mike Pellegrini <mike.pellegrini@elastic.co>
* Update docs/reference/search/retriever.asciidoc
Co-authored-by: Mike Pellegrini <mike.pellegrini@elastic.co>
* Apply suggestions from code review
Co-authored-by: Mike Pellegrini <mike.pellegrini@elastic.co>
* Give parameters subheading an explicit id
* Fix formatting
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Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>
Co-authored-by: Liam Thompson <32779855+leemthompo@users.noreply.github.com>
Co-authored-by: Mike Pellegrini <mike.pellegrini@elastic.co>
