Query language used by kiwix-search

[aikrahguzar]

If I run,

kiwix-search -s -v Downloads/wikipedia_en_mathematics_maxi_2024-06.zim hens

the first line of the output is,

Parsed query 'hens' to Query((((WILDCARD SYNONYM hens OR Zhen@1) OR hens) OR (0posanchor PHRASE 2 hens)))

is the query language documented somewhere and is it possible to use in queries to kiwix-search? I think it will very useful.