Reference: Apache Tika
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The Apache Tika is a scraper for various file formats. It's a search-engine component. 

A 2020_01_30 citation from tika.apache.org: " The Apache Tika™ toolkit detects and extracts metadata and text from over a thousand different file types (such as PPT, XLS, and PDF). All of these file types can be parsed through a single interface, making Tika useful for search engine indexing, content analysis, translation, and much more."