>> I don't know if Nutch has a built-in support for this,
>> language-detector
>> seems to be dedicated only to another task.
>You can use the field value added by the language detector to reject the page 
>from being indexed. Create a custom indexing filter, skipping all documents 
>you don't need.

Thanks Markus. I'm new to Nutch. I can do that by means of setup files,
or you mean it better to write a new plugin ?

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