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const redaction = require('@groupdocs/groupdocs.redaction');
const java = require('java');
const Dimension = java.import('java.awt.Dimension');
const Point = java.import('java.awt.Point');

const redactor = new redaction.Redactor('Sample.pdf');
        try 
        {
            // Get the actual size information for the last page:
const info = redactor.getDocumentInfo();
const lastPage = info.getPages().get(info.getPageCount() - 1);
const options = new redaction.ReplacementOptions('[secret]');
            options.setFilters(new redaction.RedactionFilter[] {
                new redaction.PageRangeFilter(redaction.PageSeekOrigin.End, 0, 1),
                new redaction.PageAreaFilter(new Point(0, lastPage.getHeight()/2),
                    new Dimension(lastPage.getWidth(), lastPage.getHeight()/2))
            });
const result = redactor.apply(new redaction.ExactPhraseRedaction('bibliography', false, options));
            if (result.getStatus() !== redaction.RedactionStatus.Failed)
            {
                redactor.save();
            }                            
        }
        finally {
  redactor.close();
}