ES Match query analogue in Lucene - elasticsearch

Question

I use queries like this one to run in ES:
boolQuery.must(QueryBuilders.matchQuery("field", value).minimumShouldMatch("50%"))
What's the straight analogue for this query in Lucene?

Answer 1

Match Query, as I understand it, basically analyzes the query, and creates a BooleanQuery out of all the terms the analyzer finds. You could get sorta close by just passing the text through QueryParser.
But you could replicate it something like this:
public static Query makeMatchQuery (String fieldname, String value) throws IOException {
//get a builder to start adding clauses to.
BooleanQuery.Builder qbuilder = new BooleanQuery.Builder();
//We need to analyze that value, and get a tokenstream to read terms from
Analyzer analyzer = new StandardAnalyzer();
TokenStream stream = analyzer.tokenStream(fieldname, new StringReader(value));
stream.reset();
//Iterate the token stream, and add them all to our query
int countTerms = 0;
while(stream.incrementToken()) {
countTerms++;
Query termQuery = new TermQuery(new Term(
fieldname,
stream.getAttribute(CharTermAttribute.class).toString()));
qbuilder.add(termQuery, BooleanClause.Occur.SHOULD);
}
stream.close();
analyzer.close();
//The min should match is a count of clauses, not a percentage. So for 50%, count/2
qbuilder.setMinimumNumberShouldMatch(countTerms / 2);
Query finalQuery = qbuilder.build();
return finalQuery;
}