To my knowledge there is nothing built into the platform that would allow it to do this.

However, if you can find C# or Java libraries that would do this you could write an extension.

Here is a module that uses iText that might do what you're looking for with PDFs

I believe OutSystems launched an ElasticSearch module into the forge which allows you to index your apps into a remote ElasticSearch server and enables this type of functionality. For whatever reason it is not listed as an officially supported module on the forge, but it is a part of SilkUI now and a part of the OutSystems 10 documentation:

https://success.outsystems.com/Documentation/SILK_UI_Framework/Elasticsearch_Web_Component