Indexed fields - Search learning Catalog

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Hi there,

When I search a course/offering into the learning catalog, which are the indexed fields through which the search in based on?

I experienced that surely the name of the course/offering is an indexed field; nevertheless, I was wondering if the description of a course/offering, for example, was also an indexed-default field?

Overall, do you know which are the index-default fields through which the search in based on?

Thanks in advance,

Francesco