2019 Update:

Now with SOLR, releases and release groups are still not found through release group aliases.

• https://musicbrainz.org/search?query=album+blanc&type=release_group&method=indexed
  - https://musicbrainz.org/search?query=album+blanc&type=release&method=indexed
• https://musicbrainz.org/search?query=white+album&type=release_group&method=indexed
• https://musicbrainz.org/search?query=white+album&type=release&method=indexed

They don’t find THE BEATLES’ WHITE ALBUM.

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Original ticket text:

plurielles is not found, despite my search hint addition.
Search hints do work on some other entities, like artists (even when just added).
Here I still have to know the word is split in two ("pluri elles") to find it.

Also, maybe unrelated, I think the RG search hint should help the release searches as well (plurielles).