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// Implementing document loader
private static class DocumentLoader implements IDocumentLoader {
    private final String filePath;
    private final String documentKey;

    public DocumentLoader(String filePath) {
        this.filePath = filePath;
        documentKey = FilenameUtils.getName(filePath);
    }

    public final String getDocumentKey() {
        return documentKey;
    }

    public final void closeDocument() {
    }

    public final Document loadDocument() {
        try {
            String extension = "." + FilenameUtils.getExtension(filePath);
            Path path = Paths.get(filePath);
            byte[] buffer = Files.readAllBytes(path);
            ByteArrayInputStream stream = new ByteArrayInputStream(buffer);
            Document document = Document.createFromStream(documentKey, new Date(System.currentTimeMillis()), extension, stream);
            return document;
        }
        catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

...

String filePath = "c:\\MyDocuments\\SomeDocument.pdf";
String indexFolder = "c:\\MyIndex\\";

// Creating an index in the specified folder
Index index = new Index(indexFolder);

// Indexing the document from stream
DocumentLoader documentLoader = new DocumentLoader(filePath);
Document document = Document.createLazy(DocumentSourceKind.Stream, documentLoader.getDocumentKey(), documentLoader);
Document[] documents = new Document[] { document };
index.add(documents, new IndexingOptions());

// Searching in the index
SearchResult searchResult = index.search("Einstein");

// Deleting indexed document from the index
String[] documentKeys = new String[] { documentLoader.getDocumentKey() };
DeleteResult deleteResult = index.delete(new UpdateOptions(), documentKeys);