The term structure uses a mapping list to match different words with same root, to their terms. The process is easy for general words. But special words like numbers and names are running out of content, because their roots are different from each other. However, from the perspective of search algorithm, all special names are just names.  Once a dynamic field is created, all the words defined in the dynamic field become unified from the perspective of the search algorithm. By using @ [name of the dynamic field] syntax, dynamic field can be used as a term.

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