Hello, Can anyone help me with an example of using PostingsHighlighter in Lucene 4.7. I am trying to modify SearchFiles.java (which can be found in the demo directory) so that it would display not only which documents contains the terms I was searching for, but also the entire sentences where it found those terms. For example, if I am looking for "brown dog" and document 1 contains a sentence "I have a brown dog", I'd like to see something like this:
doc = 1, score = ####, matching sentence = "I have a brown dog" so I have: IndexReader reader = DirectoryReader.open(FSDirectory.open(new File(index))); IndexSearcher searcher = new IndexSearcher(reader); Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_47,emptyset); AnalyzingQueryParser parser = new AnalyzingQueryParser(Version.LUCENE_47, field, analyzer); Query query = parser.parse("brown dog"); PostingsHighlighter highlighter = new PostingsHighlighter(); TopDocs results = searcher.search(query, 5 * hitsPerPage); String highlights[] = highlighter.highlight("contents", query, searcher, results); for (int k = 0; k< highlights.length; k++) { System.out.println("highlights[ " + k + "] is " + highlights[k]); } I get the documents and the scores but the highlights[#] elements are always null. What am I doing wrong? Thanks! Natalia