The indexed_search extension is set in Typo3 v.9.5.3, v.9.5.9 but doesn't work so far.

Isn't fully explored about the reason.

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Rules

Only words with 2 or more characters are accepted
Max 200 chars total
Space is used to split words, "" can be used to search for a whole string (not indexed search then)
AND, OR and NOT are prefix words, overruling the default operator
+/|/- equals AND, OR and NOT as operators.
All search words are converted to lowercase.