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Thanks Doğacan Güney's reply:

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Nutch supports different analyzers, but it is a bit limited. By
default, documents are analyzed with NutchDocumentAnalyzer. If an
analysis plugin is enabled (such as analysis-fr), and a document is
written a language specified by an analysis plugin, that document is
analyzed by the plugin instead of NutchDocumentAnalyzer.

For example, analysis-fr is for analyzing French documents so if a
document is in French (probably recognized by language-identifier)
then that document is analyzed by analysis-fr, instead of default
analyzer.

So, you can either define a new analyzer plugin or change
NutchDocumentAnalyzer to process documents with a different analyzer.

(PS:As I said before, this scheme is a bit limited and it is actually
one of the things that we want to improve. )