Default robot policies ($wgNamespaceRobotPolicies) as well as `__INDEX__` & `__NOINDEX__` are not applied in Flow boards.
Difference between Flow & other pages is that Flow content is in multiple pages: a topic is in the board, and in a Topic:xyz page.
I'm not aware of any possibility for partial search engine directives, where parts of a page are indexable and other are not, so we may have to support it only on a board level and let it trickle down to Topic:xyz pages?
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Excerpt from Article::view, although we'll likely have to extract `__INDEX__` & `__NOINDEX__` from header descriptions ourselves still:
```
# Check for any __NOINDEX__ tags on the page using $pOutput
$policy = $this->getRobotPolicy( 'view', $pOutput );
$outputPage->setIndexPolicy( $policy['index'] );
$outputPage->setFollowPolicy( $policy['follow'] );
```