Legacy URL mappings

This legacy-url-mappings.yml file manages legacy URL patterns for Elastic documentation, mapping the path of each legacy build URL to a list of documentation versions. It ensures that users can easily find previous versions of our documentation.

This example maps documentation that references `elastic.co/guide/en/elasticsearch/reference/ to Elastic Stack versioned URL paths:

en/elasticsearch/reference/: *stack

stack anchor

Defines a reusable list of version strings for "stack" projects, e.g., [ '9.0+', '8.18', ... ].

mappings

A YAML mapping where each key is a legacy documentation URL path (like en/apm/agent/java/) and the value is a list of asciidoc versions that exist for that path.