const searchLib = require('@groupdocs/groupdocs.search')
// Configure an index to exclude unwanted file formats
IndexSettings settings = new IndexSettings();
DocumentFilter fileExtensionFilter =
searchLib.DocumentFilter.createFileExtension(".odp", ".png", ".rtf");
DocumentFilter invertedFilter =
searchLib.DocumentFilter.createNot(fileExtensionFilter);
settings.setDocumentFilter(invertedFilter);
Index index = new searchLib.Index("c:/MyIndex", settings);
// Specify the directory containing documents
index.add("c:/MyDocuments");
// Process search output for further use
const result = index.Search("Lorem", options);
// Process search output for further use
console.log('Documents: ' + result.getDocumentCount());
console.log('Occurrences: ' + result.getOccurrenceCount());