Lucene search result - lucene

Question

I have a below data index in lucene 4.8 and code.
Finance expense
Admin expenses
Transaction expense
Salary expenses
indexing:
try {
writer = createWriter(ramDirectory);
for(String line : readFile(FILE_PATH)) {
String[] split = line.split(",");
Document doc = new Document();
doc.add(new TextField("id", split[0].trim(), Field.Store.YES));
doc.add(new TextField("name", split[1].trim(), Field.Store.YES));
writer.addDocument(doc);
}
writer.commit();
} finally {
if(writer != null) {
writer.close();
}
}
search
IndexSearcher searcher = new IndexSearcher(DirectoryReader.open(ramDirectory));
QueryParser nameQParser = new QueryParser(Version.LUCENE_48, "name", new StandardAnalyzer(Version.LUCENE_48));
Query query = nameQParser.parse("expense");
TopDocs queryResults = searcher.search(query, 10);
Above code return only below two result. It does not return result which has 's' in it at the end.
Current outcome:
Finance expense
Transaction expense
Expected outcome:
Finance expense
Admin expenses
Transaction expense
Salary expenses
Please suggest what is wrong in my code.

Answer 1

You could use WildCardQuery, because the word expense contains in all four document so you can pass search string as *expense* which will return all documents having expense in name field. Don't forget to set up QueryParser to allow leading wildcards with the following:
QueryParser.setAllowLeadingWildcard(true)
Make following changes in your code:
nameQParser.setAllowLeadingWildcard(true);
Query query = nameQParser.parse("*expense*");

Answer 2

Generally, the best way to deal with plurals is to use an analyzer that handles them better. EnglishAnalyzer includes a stemmer that should handle that. It would reduce both "expense" and "expenses" (and "expensed", and "expensing") to the stem "expens" in the index.
Anternately, somewhat clunkier, but you could just use a prefix query in this case: Query query = nameQParser.parse("expense*");