oak-lucene/src/main/java/org/apache/jackrabbit/oak/plugins/index/lucene/LuceneIndex.java [870:885]:
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    private static void addReferenceConstraint(String uuid, List<Query> qs,
            IndexReader reader) {
        if (reader == null) {
            // getPlan call
            qs.add(new TermQuery(new Term("*", uuid)));
            return;
        }

        // reference query
        BooleanQuery bq = new BooleanQuery();
        Collection<String> fields = MultiFields.getIndexedFields(reader);
        for (String f : fields) {
            bq.add(new TermQuery(new Term(f, uuid)), SHOULD);
        }
        qs.add(bq);
    }
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oak-lucene/src/main/java/org/apache/jackrabbit/oak/plugins/index/lucene/LucenePropertyIndex.java [1380:1395]:
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    private static void addReferenceConstraint(String uuid, List<Query> qs,
                                               IndexReader reader) {
        if (reader == null) {
            // getPlan call
            qs.add(new TermQuery(new Term("*", uuid)));
            return;
        }

        // reference query
        BooleanQuery bq = new BooleanQuery();
        Collection<String> fields = MultiFields.getIndexedFields(reader);
        for (String f : fields) {
            bq.add(new TermQuery(new Term(f, uuid)), SHOULD);
        }
        qs.add(bq);
    }
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