Simplified QueryTermExtractor.java to make use of Query.extractTerms method (especially now that all the SpanQuery classes implement this correctly).
Added tests in Junit test to demonstrate new support for other Queries (FilteredQuery) now that we use the standard extractTerms feature of Query objects.
Also deprecated highlighter getBestFragments method that hard-coded choice of fieldname and introduced new variation that takes an additional fieldName argument
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lucene/java/trunk/contrib/highlighter/src/java/org/apache/lucene/search/highlight/Highlighter.java