Let's make this a FirstTimer issue? It will help them understand the backend better.

Which methods are you referring to? (any specific classes / package ? )
It may be better if we can identify where the documentation is needed

The addAuthorEmailsAndAliasesMapEntry in AuthorConfiguration for example doesn't have it. Though it is not something too important to add, such methods when edited, cause an error in Travis, due to having no javadoc. Therefore, I feel it is better to find such methods and add them.

I think our checkstyle config does check for presence of javadocs.
Perhaps we can investigate if the config is sufficiently strict in detecting missing javadoc comments?

For the specific case you mentioned, I think it can be a first timer issue, but perhaps issue #1207 should be resolved first as it affects the same data structure