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const filePath = 'c:/MyDocuments/SomeDocument.pdf';
const indexFolder = 'c:/MyIndex/';
const query = 'Einstein';

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

// Indexing the document from stream
const documentKey = path.basename(filePath);
const documentLoader = java.newProxy('com.groupdocs.search.common.IDocumentLoader', {
  closeDocument: function () {},
  loadDocument: function () {
    const millis = java.callStaticMethodSync('java.lang.System', 'currentTimeMillis');
    const time = java.newInstanceSync('java.util.Date', millis);
    const extension = path.extname(filePath);
    const buffer = Utils.readBinaryFile(filePath);
    const array = Array.prototype.slice.call(buffer, 0);
    const buf = java.newArray('byte', array);
    const stream = java.newInstanceSync('java.io.ByteArrayInputStream', buf);
    const document = java.callStaticMethodSync(
      'com.groupdocs.search.Document',
      'createFromStream',
      documentKey,
      time,
      extension,
      stream,
    );
    return document;
  },
});

const document = java.callStaticMethodSync(
  'com.groupdocs.search.Document',
  'createLazy',
  groupdocs.search.DocumentSourceKind.Stream,
  documentKey,
  documentLoader,
);
const documents = java.newArray('com.groupdocs.search.Document', [document]);

// Subscribe to index events
const eventHandler = java.newProxy('com.groupdocs.search.events.EventHandler', {
  invoke: function (sender, args) {
    console.log(args.getMessage()); // Writing error messages to the console
  },
});
index.getEvents().ErrorOccurred.add(eventHandler);

index.add(documents, new groupdocs.search.IndexingOptions());

// Getting indexed documents from the index
const indexedDocuments1 = index.getIndexedDocuments();

// Writing indexed documents to the console
console.log('Indexed documents (' + indexedDocuments1.length + '):');
for (let i = 0; i < indexedDocuments1.length; i++) {
  const info = indexedDocuments1[i];
  console.log('\t' + info);
}

// Searching in the index
const searchResult1 = index.search(query);

// Deleting indexed document from the index
const documentKeys = java.newArray('java.lang.String', [documentKey]);
const deleteResult = index.delete(new groupdocs.search.UpdateOptions(), documentKeys);
console.log('\nDeleted documents: ' + deleteResult.getSuccessCount());

// Getting indexed paths after deletion
const indexedDocuments2 = index.getIndexedDocuments();

console.log('\nIndexed documents (' + indexedDocuments2.length + '):');
for (let i = 0; i < indexedDocuments2.length; i++) {
  const info = indexedDocuments2[i];
  console.log('\t' + info);
}

// Searching in the index
const searchResult2 = index.search(query);