Docling extraction on elin GPU

Docling extraction on elin GPU is the core process used by the Docling extraction system for document processing using GPU. Docling extraction runs mandatorily on the elin GPU server for DOCX and PPTX extraction with no fallback. The Install_docling_elin.sh script installs Docling 2.75.0 and dependencies on the elin GPU server for mandatory extraction. Docling-based extraction leverages the RTX 4000 SFF Ada 20GB GPU available on elin for DOCX and PPTX file processing.