This is a refactoring of the internal logic that's used to translate
query-level into index-level field names for query APIs for
security entities (i.e. users, API Keys, and soon, roles).
The objective here is to have and reuse a single class to handle
all the translations for different security query APIs.
* Remove `es-test-dir` book-scoped variable
* Remove `plugins-examples-dir` book-scoped variable
* Remove `:dependencies-dir:` and `:xes-repo-dir:` book-scoped variables
- In `index.asciidoc`, two variables (`:dependencies-dir:` and `:xes-repo-dir:`) were removed.
- In `sql/index.asciidoc`, the `:sql-tests:` path was updated to fuller path
- In `esql/index.asciidoc`, the `:esql-tests:` path was updated idem
* Replace `es-repo-dir` with `es-ref-dir`
* Move `:include-xpack: true` to few files that use it, remove from index.asciidoc
Adds support for the aggs request body parameter to the Query API Key Information API.
This parameter works identically to the well known eponymous parameter of the _search endpoint,
but the set of allowed aggregation types as well as the field names allowed is restricted.
