From R10 Documentation
The Domino® server and Notes® standard client use Apache Tika 1.18 open source conversion filters to extract text for full-text searches of attachments. Tika replaces the KeyView conversion filter used in previous releases.
The implementation of Tika supports the ability to:
Tika runs as a Java™ process when you start the Notes standard client or Domino. The process calls tika-server.jar, which starts the HTTP task and listens for text extraction requests on port 9998, by default. If you upgrade to Notes or Domino 10, full-text indexes that previously used KeyView filters to extract text are rebuilt using the Tika filters.
For the list of file formats supported by Tika 1.18, see the Apache Tika web site.
When we create FTI in 10.0.1 the java.exe process will start as it covers a broad range of attachments it will consume more memory.