When I search for words with an 's' at the end (e.g. 'cats', 'dogs') the 's' is automatically cut and documents with 'cat' and 'dog' are found.
This is correct.
In the English language most plurals are created by adding an 's'.
This is different in other European languages. To prevent, that the 's' is cut, you need to change the
language in the Parse Settings for the Knowledge Search from 'English' to 'Other European'.
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After this change, it's required to run pdm_k_reindex