Weblate: full search feature not behaving as expected

Reporting this issue here while it's more a Weblate bug that does not depend on the XWiki setup.

Steps to reproduce:

• Browse the translation page of a given component such as https://l10n.xwiki.org/projects/xwiki-platform/main-solrtranslations/fr/
• In the query field, enter a term that exists among the keys, such as "Recherche", checking the boxes "Search in source strings" and "Search in target strings"
• Leave the default option "Full text" selected
• You get no result while several translations contain the word "Recherche"

NB: switching to "substring search" will return some results though, so a workaround could consist in selecting "substring search" by default.