How to Troubleshoot the Windows Search Indexer on Windows 10

How to Troubleshoot the Windows Search Indexer on Windows 10

The icon for Microsoft's Indexer Diagnostics tool on a Windows 10 desktop.

Do you have a problem with the search function in Windows 10’s Start menu or File Explorer? Whether Windows can’t find your files, indexing is using too much CPU or search isn’t working, Microsoft’s Indexer Diagnostics tool can help troubleshoot.

This tool provides insight into the inner workings of the Windows Search indexer service, and it can help you identify problems and fixes. It’s similar to the Diagnostic Data Viewer—a power user tool that provides extra information you can’t normally see about Windows 10’s internals.

To get started, download Microsoft’s Indexer Diagnostics tool from the Microsoft Store. Launch it and give it administrator access—it needs those permissions to access and updated the Windows search indexer.

Click between the tabs in the left pane to view information about the indexing service, its status, which files it’s indexing, and what it’s searching. There are also various troubleshooting tools on this pane. The main pane is “Service Status,” which will show you how many items the indexer has in its database, and how many files it’s indexed in the last hour, day, and week.

The Service Status pane in Indexer Diagnostics.

If Windows search isn’t working at all, click “Search Is Not Working” in the left pane. Use the “Restart” button to quickly restart the search service to fix problems.

If that doesn’t help, click the “Reset” button to reset the state of the indexing service. This will take several minutes. As the interface points out, a reset “will help if the Search Indexer is stuck in a bad state.”

Troubleshooting Windows Search not working in Indexer Diagnostics.

If search can’t find a file, click “Is my file being indexed?”, browse to the file you want Windows to find, and click “Verify.”

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Windows will tell you whether the file is found in the search index and, if not, will explain why the search indexer is ignoring it so you can address any problems.

Testing whether a file is being indexed and why in Microsoft's Indexer Diagnostics.

Other tools available in Indexer Diagnostics include:

  • What is being indexed? – Displays the paths being indexed and any excluded paths that aren’t being indexed. You can add and remove included and excluded paths here.
  • Search roots – Shows you where Windows will begin searching—for example, in the root of the C:\ directory.
  • Content Viewer – View the files the indexer is indexing, and the precise time it indexed them. For example, if the search indexer was using a lot of CPU at a specific time, you can see what files it was indexing at that time and consider excluding them from “What is being indexed?”.
  • Query Viewer – Monitor what search queries are being sent to the Windows search indexer. You can click “Start Listening,” perform searches, and see exactly what’s going on in the background.
  • Index Item Stats – View how many items are indexed per each app on your system. You can also export details about the index to a CSV file.
  • Feedback – This tab lets you collect traces and logs that will monitor the indexer’s resource usage and functions. There’s a “File Bug” button here that will let you file reports about problems with the indexer with Microsoft.

Many of these functions are only useful for developers working on the search indexer or people sending bug reports to those developers, but it’s still great to have such insight into the inner workings of Windows 10.

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Microsoft has been addressing resource usage problems with the indexer—look at the fixes made in Windows 10’s May 2020 Update—and this tool suggests Microsoft’s developers are hard at work optimizing the search feature, reducing resource usage, and fixing bugs.

RELATED: How to See a Drive’s File System on Windows 10

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Lucila is a freelance writer and lifelong learner with an ongoing curiosity to study new things. She enjoys checking out the latest grammar books and writing about video games more than anything else. If she's not running through Colorado’s breathtaking landscape, she's indoors hidden away in her cozy game room trolling noobs and leveling up an RPG character. She is a Final Fantasy IX apologist (although she loves them all… except XV), coffee aficionado, and a bit of a health nut. Lucila graduated from Western Kentucky University with a B.A. in English Literature with a minor in Creative Writing.

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