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Stop words

Background

Stop words are commonly used words that are removed from a user's query before running a search.

Query processing behaviour

In normal query processing Funnelback will ignore words from the stop words list when it runs a query.

Stop words can always be removed by setting the -ras=2 query processor option, or never removed by setting -ras=0. The default, -ras=1 removes the stop words when the query contains fewer that two words which are not stop words.

Stop words are not removed from within a phrase operator.

Example

Remove all stop words

query_processor_options= -ras=2

Configuring the stop words list

The default stop words applied is localised based on the value of the lang CGI parameter, defaulting to English if the parameter is not set.

Stop word lists are supplied for the following languages, and are used when the lang CGI parameter is set to the language code. The lang parameter can be specified with sub variants that are appended with an underscore. e.g. lang=en_US will apply the English stop words list.

Language codeLanguage
arArabic
bgBulgarian
bnBengali
csCzech
deGerman
enEnglish
esSpanish
faPersian
fiFinnish
frFrench
hiHindi
huHungarian
itItalian
mrMarathi
plPolish
ptPortugese
roRomanian
ruRussian
svSwedish

A custom stop words list can be used instead of the default list by defining the -STOP query processor option. The value should be set to the absolute path to the text file containing the stop words, or path relative the the $SEARCH_HOME/share/lang folder.

Note: only a single stop words list is applied. If you wish to use a custom stop words list it must include all the words to consider as stop words and is not combined with the locale specific default list.

Default value

-STOP=$SEARCH_HOME/share/lang/en_stopwords

Example

Set the stopwords to custom_stopwords.txt stored in the collection's configuration folder:

query_processor_options= -STOP=$SEARCH_HOME/conf/$COLLECTION_NAME/custom_stopwords.txt

or

query_processor_options= -STOP=../../conf/$COLLECTION_NAME/custom_stopwords.txt

Default stop words list (English)

The following words are stripped from a user's query (subject to the stop word removal rules defined by the ras query processor option).

The English stop words list is located within the Funnelback installation at: INSTALL_DIRECTORY/share/lang/en_stopwords. Stop words lists for other languages can also be viewed by inspecting the appropriate file within the same folder.

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