Porter stem token filter

A token filter of type porter_stem that transforms the token stream as per the Porter stemming algorithm.

Note, the input to the stemming filter must already be in lower case, so you will need to use Lower Case Token Filter or Lower Case Tokenizer farther down the Tokenizer chain in order for this to work properly!. For example, when using custom analyzer, make sure the lowercase filter comes before the porter_stem filter in the list of filters.