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String indexFolder = "c:\\MyIndex\\";
String documentsFolder = "c:\\MyDocuments\\";

// Creating an index settings instance
IndexSettings settings = new IndexSettings();
settings.setTextStorageSettings(new TextStorageSettings(Compression.High)); // Enabling the storage of extracted text in the index

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

// Indexing documents from the specified folder
index.add(documentsFolder);

// Getting list of indexed documents
DocumentInfo[] documents = index.getIndexedDocuments();

// Getting a document text
if (documents.length > 0) {
    DocumentInfo document = documents[0];

    // Output to a file
    FileOutputAdapter fileOutputAdapter = new FileOutputAdapter(OutputFormat.Html, "C:\\Text.html");
    index.getDocumentText(document, fileOutputAdapter);

    // Output to a stream
    try (OutputStream stream = new ByteArrayOutputStream()) {
        StreamOutputAdapter streamOutputAdapter = new StreamOutputAdapter(OutputFormat.Html, stream);
        index.getDocumentText(document, streamOutputAdapter);
    }

    // Output to a string
    StringOutputAdapter stringOutputAdapter = new StringOutputAdapter(OutputFormat.Html);
    index.getDocumentText(document, stringOutputAdapter);
    String htmlText = stringOutputAdapter.getResult();
    System.out.println(htmlText);

    // Output to a structure
    StructureOutputAdapter structureOutputAdapter = new StructureOutputAdapter(OutputFormat.PlainText);
    index.getDocumentText(document, structureOutputAdapter);
    DocumentField[] fields = structureOutputAdapter.getResult();
    System.out.println(document.toString());
    for (DocumentField field : fields) {
        System.out.println("\t" + field.getName());
    }
}