private Analyzer fromComponents(AnalyzerKey analyzerKey) {
        Analyzer analyzer = analyzerComponents.getComponent(analyzerKey.languageCodeAndStemMode());
        return (null != analyzer) ? analyzer : analyzerComponents.getComponent(analyzerKey.languageCode());
    }
First, checks if a component is configured for a languageCode + StemMode.
Second, checks if Analyzer is configured only for a languageCode.
lucene-linguistics/src/main/java/com/yahoo/language/lucene/AnalyzerFactory.java