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const indexFolder = 'c:/MyIndex/';
const documentsFolder = 'c:/MyDocuments/';

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

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

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

// Getting list of indexed documents
const documents = index.getIndexedDocuments();

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

  // Output to a file
  const fileOutputAdapter = new groupdocs.search.FileOutputAdapter(groupdocs.search.OutputFormat.Html, 'c:/Result.html/');
  index.getDocumentText(document, fileOutputAdapter);

  // Output to a stream
  const stream = java.newInstanceSync('java.io.ByteArrayOutputStream');
  const streamOutputAdapter = new groupdocs.search.StreamOutputAdapter(groupdocs.search.OutputFormat.Html, stream);
  index.getDocumentText(document, streamOutputAdapter);

  // Output to a string
  const stringOutputAdapter = new groupdocs.search.StringOutputAdapter(groupdocs.search.OutputFormat.Html);
  index.getDocumentText(document, stringOutputAdapter);
  const result = stringOutputAdapter.getResult();
  //console.log(result);

  // Output to a structure
  const structureOutputAdapter = new groupdocs.search.StructureOutputAdapter(groupdocs.search.OutputFormat.PlainText);
  index.getDocumentText(document, structureOutputAdapter);
  const fields = structureOutputAdapter.getResult();
  console.log(document.toString());
  for (const field of fields) {
    console.log('\t' + field.getName());
  }
}