First of all follow the steps to change the search or indexing settings
1. Go to file , click option and then click search on the left-hand side.
2. Now click Indexing option.
3. click on the advanced button option.
4. Now you need to change the index settings to Rebuilt
It may help you out, but if the problem still persists then you can follow the link given below
Know How to Get Rid Of Outlook PST Indexing Error
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