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Stopwords allows you to ignore identified words at the indexing phase.

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Go to the administration interface. Then, go to the administration left menu, click on Search Engine Configuration and select Stopwords in the dropdown list.
Stopwords are language specific. You need to select the language for which you want to manage the stopwords. Once this is done, you get a text window allowing you to edit the stopwords list. Note that only one search expert at a given time can edit this file. Any other simultaneous tentative will end up with an error message on the screen.
Once you are ok with your modifications, click on the 'Confirm' button. The modifications are immediately taken into account with no further action.

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