I'm reading the documentation at 
https://jena.apache.org/documentation/query/text-query.html but I don't 
understand if this is only for full-text searches. Or should I use one of these 
indexes every time I use one the string functions 
(https://www.w3.org/TR/sparql11-query/#func-strings) such as CONTAINS, LCASE, 
etc.?

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