将字符串列表添加到 Lucene 文档

Question

Suppose I've a field which is a List (Say : "Key" : ["value1", "value2", "value3"]. How do add it to a lucene document in a sequence map. I'm currently loading the content from a file in a sequence and mapping each entry to a document and for each entry adding the document using index writer.

seq(items)
        .map(item -> {
            Document document = new Document();
            document.add(new TextField("field", item.field(), Field.Store.YES));
            return document;
        })
        .forEach(consumer(indexWriter::addDocument));

I'm not struggling to add a field which is a list of strings to the above index document. Can someone please help ?

Answer 1

You don't need to create a document per value in that field but conversely, using the same document you just use document.add(<field>) for each value of the list (provided that field is defined as multivalued) :

Document document = new Document();
seq(items).map(item -> {
  document.add(new TextField('field', item.field(), Field.Store.YES));
});
yourIndexWriter.addDocument(document);