SharePoint 2013 search error ‘Sandbox worker is closed’

I encountered the following error while crawling our site collections.

Processing this item failed because of an unknown error when trying to parse its contents. (Error parsing document ‘<doc>’, Sandbox worker pool is closed ; ; SearchID = <GUID>

Only titles of document were crawled using search which resulted in search only showing titles and Office Web Apps preview wasn’t working.

Solution
I have granted the service account the proper permissions and configured the service account correctly using Central Administration –> Security –> Configure Service Accounts

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You can first try to use the farm account because this service account should have the appropriate permissions. The errors were gone after a full crawl of all content sources and search was working again.

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