Add explicit warning not to touch repository contents (#81295)
Add explicit warning not to touch repository contents (#81295)

Manipulating the contents of a snapshot repository is a very bad idea,
but it turns out we don't call this out in the docs anywhere. This
commit adds a warning about this.
GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch