Apache Solr Reference Guide Covering Apache Solr 6.0

In: "To be, or not to be."
Tokenizer to Filter: "To"(1), "be"(2), "or"(3), "not"(4), "to"(5), "be"(6)
Out: "To be"(1), "To be or"(1), "To be or not"(1), "be or"(2), "be or not"(2), "be or not to"(2), "or not"(3), "or not
to"(3), "or not to be"(3), "not to"(4), "not to be"(4), "to be"(5)
Snowball Porter Stemmer Filter
This filter factory instantiates a language-specific stemmer generated by Snowball. Snowball is a software
package that generates pattern-based word stemmers. This type of stemmer is not as accurate as a table-based
stemmer, but is faster and less complex. Table-driven stemmers are labor intensive to create and maintain and
so are typically commercial products.
Solr contains Snowball stemmers for Armenian, Basque, Catalan, Danish, Dutch, English, Finnish, French,
German, Hungarian, Italian, Norwegian, Portuguese, Romanian, Russian, Spanish, Swedish and Turkish. For
more information on Snowball, visit http://snowball.tartarus.org/ .
StopFilterFactory, CommonGramsFilterFactory, and CommonGramsQueryFilterFactory can
optionally read stopwords in Snowball format (specify format="snowball" in the configuration of those
FilterFactories).
Factory class: solr.SnowballPorterFilterFactory
Arguments:
language: (default "English") The name of a language, used to select the appropriate Porter stemmer to use.
Case is significant. This string is used to select a package name in the "org.tartarus.snowball.ext" class
hierarchy.
protected: Path of a text file containing a list of protected words, one per line. Protected words will not be
stemmed. Blank lines and lines that begin with "#" are ignored. This may be an absolute path, or a simple file
name in the Solr config directory.
Example:
Default behavior:
In: "flip flipped flipping"
Tokenizer to Filter: "flip", "flipped", "flipping"
Out: "flip", "flip", "flip"
Example:
French stemmer, English words:
Apache Solr Reference Guide 6.0
135