Well after a few hours of playing with it, I finally gave up and decided
to try a different stem analyzer from another post. Specifically:
require 'rubygems'
require 'ferret'
class StemmedAnalyzer < Ferret::Analysis::Analyzer
include Ferret::Analysis
def initialize(stop_words = ENGLISH_STOP_WORDS)
@stop_words = stop_words
end
def token_stream(field, str)
StemFilter.new(StopFilter.new(LowerCaseFilter.new(StandardTokenizer.new(str)),
@stop_words))
end
end
The error seems to have disappeared now. Very strange indeed.
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