If you are getting notifications from IndexerPortal, then your Mac is infected with adware. IndexerPortal is adware for Mac.
IndexerPortal changes setting in your Mac. First, IndexerPortal installs a browser extension in your browser. Then, after IndexerPortal hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.