Restrict testing of legacy discovery to tests #61178
Merged
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The 7.x branch preserves the legacy discovery mechanism from 6.x purely
for running internal cluster tests; this mechanism is otherwise
completely untested and unsupported. However it is still technically
possible to use it if you dig through the source code to work out what
settings we set in tests. With this change we make it impossible to use
this mechanism in production.
Closes #61177