To prevent terms from being stemmed use an instance of {@link KeywordMarkerFilter} or a custom {@link TokenFilter} that setsthe {@link KeywordAttribute} before this {@link TokenStream}.
NOTE: Input is expected to be casefolded for Greek (including folding of final sigma to sigma), and with diacritics removed. This can be achieved by using either {@link GreekLowerCaseFilter} or ICUFoldingFilter before GreekStemFilter. @lucene.experimental
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