Add a LowerCase filter to the current indexes

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Add a LowerCase filter to the current indexes

Answer: D

Explanation:

A Synonym filter can help to map different terms that have the same meaning, such as “cat” and “feline”. A LowerCase filter can help to normalize the case of the terms, so that “cats and dogs” and “Cats and Dogs” are treated the same.

Reference: 1 Lucene Analyzers section