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Unreal Engine 4 integraton of Apache Tika™, a java based library to detect and extract metadata and text from over a thousand different file types (such as PPT, XLS, and PDF).
For more details on the formats supported: Supported Formats
A first C++ wrapper is taking care of the creation of a Java Virtual Machine(JVM) as well as loading the Tika Java library via JNI.
It is then encapsulated in a DLL which is dynamically loaded by UE4 and called from a blueprint library.
Since the plugin is using a Java virtual machine, you will see memory exceptions if you are using Visual Studio. You can just skip them.